Samuel Dahl

Position: DF ▪ Footed: Left

171cm, 68kg (5-7½, 150lb)

Born: March 4, 2000

Youth National Team: Sweden se

Club: Roma

Become a Stathead & surf this site ad-free.

2024-2025

Serie A

Min

Gls

Ast

0.0

npxG

0.0

xAG

0.0

SCA

GCA

* see our coverage note

Last 5 Matches

Last 5 Matches Table
											Performance												Expected			SCA		Passes				Carries		Take-Ons
Date	Day	Comp	Round	Venue	Result	Squad	Opponent	Start	Pos	Min	Gls	Ast	PK	PKatt	Sh	SoT	CrdY	CrdR	Touches	Tkl	Int	Blocks	xG	npxG	xAG	SCA	GCA	Cmp	Att	Cmp%	PrgP	Carries	PrgC	Att	Succ	Match Report
2024-07-20	Sat	Allsvenskan	Matchweek 15	Away	L 1–2	Djurgården	Kalmar	Y	LB	90	0	0	0	0	0	0	0	0			0															Match Report
2024-07-14	Sun	Allsvenskan	Matchweek 14	Home	W 1–0	Djurgården	Värnamo	Y	LB	90	0	0	0	0	0	0	0	0			3															Match Report
2024-07-08	Mon	Allsvenskan	Matchweek 13	Away	W 3–1	Djurgården	Norrköping	Y	LB	90	0	0	0	0	1	0	0	0			0															Match Report
2024-06-02	Sun	Allsvenskan	Matchweek 12	Home	L 0–3	Djurgården	Hammarby	Y	LB	90	0	0	0	0	0	0	0	0			2															Match Report
2024-05-25	Sat	Allsvenskan	Matchweek 11	Away	W 3–1	Djurgården	Mjällby	Y	LB	90	0	0	0	0	0	0	0	0			0															Match Report

for the free FBref Mailing List and get curated stats, news, and updates about the FBref site to your inbox every day.

Compare Samuel Dahl to

Player News

Standard Stats: Domestic Leagues

Goal Logs

Standard Stats: Domestic Leagues Table
							Playing Time			Performance								Expected				Progression			Per 90 Minutes
Season	Age	Squad	Country	Comp	LgRank	MP	Starts	Min	90s	Gls	Ast	G+A	G-PK	PK	PKatt	CrdY	CrdR	xG	npxG	xAG	npxG+xAG	PrgC	PrgP	PrgR	Gls	Ast	G+A	G-PK	G+A-PK	xG	xAG	xG+xAG	npxG	npxG+xAG	Matches
2019	18	Västerås	se SWE	2. Superettan	10th	1	0	16	0.2	0	0	0	0	0	0	0	0								0.00	0.00	0.00	0.00	0.00						Matches

2021	20	AIK Stockholm	se SWE	1. Allsvenskan	2nd	0	0																												Matches
2022	21	Örebro	se SWE	2. Superettan	10th	27	25	2,260	25.1	0	2	2	0	0	0	2	0								0.00	0.08	0.08	0.00	0.08						Matches
2023	22	Örebro	se SWE	2. Superettan	11th	15	15	1,305	14.5	0	2	2	0	0	0	1	0								0.00	0.14	0.14	0.00	0.14						Matches
2023	22	Djurgården	se SWE	1. Allsvenskan	4th	13	13	1,166	13.0	0	3	3	0	0	0	2	0								0.00	0.23	0.23	0.00	0.23						Matches
2024	23	Djurgården	se SWE	1. Allsvenskan	4th	15	15	1,350	15.0	0	2	2	0	0	0	1	0								0.00	0.13	0.13	0.00	0.13						Matches
2024-2025	24	Roma	it ITA	1. Serie A	12th	1	0	30	0.3	0	0	0	0	0	0	0	0	0.0	0.0	0.0	0.0	1	1	2	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	Matches
5 Seasons		5 Clubs		3 Leagues		72	68	6,127	68.1	0	9	9	0	0	0	6	0	0.0	0.0	0.0	0.0	1	1	2	0.00	0.13	0.13	0.00	0.13	0.00	0.00	0.00	0.00	0.00
			Country	Comp	LgRank	MP	Starts	Min	90s	Gls	Ast	G+A	G-PK	PK	PKatt	CrdY	CrdR	xG	npxG	xAG	npxG+xAG	PrgC	PrgP	PrgR	Gls	Ast	G+A	G-PK	G+A-PK	xG	xAG	xG+xAG	npxG	npxG+xAG	Matches
Örebro (2 Seasons)				1 League		42	40	3,565	39.6	0	4	4	0	0	0	3	0								0.00	0.10	0.10	0.00	0.10
Djurgården (2 Seasons)				1 League		28	28	2,516	28.0	0	5	5	0	0	0	3	0								0.00	0.18	0.18	0.00	0.18
Västerås (1 Season)				1 League		1	0	16	0.2	0	0	0	0	0	0	0	0								0.00	0.00	0.00	0.00	0.00
Roma (1 Season)				1 League		1	0	30	0.3	0	0	0	0	0	0	0	0	0.0	0.0	0.0	0.0	1	1	2	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00
AIK Stockholm (1 Season)				1 League		0	0

Superettan (3 Seasons)						43	40	3,581	39.8	0	4	4	0	0	0	3	0								0.00	0.10	0.10	0.00	0.10
Allsvenskan (3 Seasons)						28	28	2,516	28.0	0	5	5	0	0	0	3	0								0.00	0.18	0.18	0.00	0.18
Serie A (1 Season)						1	0	30	0.3	0	0	0	0	0	0	0	0	0.0	0.0	0.0	0.0	1	1	2	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00

Become a Stathead & surf this site ad-free.

Shooting: Domestic Leagues

Goal Logs

Shooting: Domestic Leagues Table
							Standard												Expected
Season	Age	Squad	Country	Comp	LgRank	90s	Gls	Sh	SoT	SoT%	Sh/90	SoT/90	G/Sh	G/SoT	Dist	FK	PK	PKatt	xG	npxG	npxG/Sh	G-xG	np:G-xG	Matches
2019	18	Västerås	se SWE	2. Superettan	10th	0.2	0										0	0						Matches
2022	21	Örebro	se SWE	2. Superettan	10th	25.1	0										0	0						Matches
2023	22	Örebro	se SWE	2. Superettan	11th	14.5	0										0	0						Matches
2023	22	Djurgården	se SWE	1. Allsvenskan	4th	13.0	0	7	0	0.0	0.54	0.00	0.00				0	0						Matches
2024	23	Djurgården	se SWE	1. Allsvenskan	4th	15.0	0	7	1	14.3	0.47	0.07	0.00	0.00			0	0						Matches
2024-2025	24	Roma	it ITA	1. Serie A	12th	0.3	0	0	0		0.00	0.00				0	0	0	0.0	0.0		0.0	0.0	Matches
5 Seasons		5 Clubs		3 Leagues		68.1	0	14	1	7.1	0.49	0.04	0.00	0.00		0	0	0	0.0	0.0		0.0	0.0
			Country	Comp	LgRank	90s	Gls	Sh	SoT	SoT%	Sh/90	SoT/90	G/Sh	G/SoT	Dist	FK	PK	PKatt	xG	npxG	npxG/Sh	G-xG	np:G-xG	Matches
Örebro (2 Seasons)				1 League		39.6	0										0	0
Djurgården (2 Seasons)				1 League		28.0	0	14	1	7.1	0.50	0.04	0.00	0.00			0	0
Västerås (1 Season)				1 League		0.2	0										0	0
Roma (1 Season)				1 League		0.3	0	0	0		0.00	0.00				0	0	0	0.0	0.0		0.0	0.0
AIK Stockholm (1 Season)				1 League

Superettan (3 Seasons)						39.8	0										0	0
Allsvenskan (3 Seasons)						28.0	0	14	1	7.1	0.50	0.04	0.00	0.00			0	0
Serie A (1 Season)						0.3	0	0	0		0.00	0.00				0	0	0	0.0	0.0		0.0	0.0

Passing: Domestic Leagues

Passing: Domestic Leagues Table
							Total					Short			Medium			Long					Expected
Season	Age	Squad	Country	Comp	LgRank	90s	Cmp	Att	Cmp%	TotDist	PrgDist	Cmp	Att	Cmp%	Cmp	Att	Cmp%	Cmp	Att	Cmp%	Ast	xAG	xA	A-xAG	KP	1/3	PPA	CrsPA	PrgP	Matches
2019	18	Västerås	se SWE	2. Superettan	10th	0.2															0									Matches
2022	21	Örebro	se SWE	2. Superettan	10th	25.1															2									Matches
2023	22	Örebro	se SWE	2. Superettan	11th	14.5															2									Matches
2023	22	Djurgården	se SWE	1. Allsvenskan	4th	13.0															3									Matches
2024	23	Djurgården	se SWE	1. Allsvenskan	4th	15.0															2									Matches
2024-2025	24	Roma	it ITA	1. Serie A	12th	0.3	19	21	90.5	207	73	17	18	94.4	2	3	66.7	0	0		0	0.0	0.0	0.0	0	2	0	0	1	Matches
5 Seasons		5 Clubs		3 Leagues		68.1	19	21	90.5	207	73	17	18	94.4	2	3	66.7	0	0		9	0.0	0.0	+9.0	0	2	0	0	1
			Country	Comp	LgRank	90s	Cmp	Att	Cmp%	TotDist	PrgDist	Cmp	Att	Cmp%	Cmp	Att	Cmp%	Cmp	Att	Cmp%	Ast	xAG	xA	A-xAG	KP	1/3	PPA	CrsPA	PrgP	Matches
Örebro (2 Seasons)				1 League		39.6															4
Djurgården (2 Seasons)				1 League		28.0															5
Västerås (1 Season)				1 League		0.2															0
Roma (1 Season)				1 League		0.3	19	21	90.5	207	73	17	18	94.4	2	3	66.7	0	0		0	0.0	0.0	0.0	0	2	0	0	1
AIK Stockholm (1 Season)				1 League

Superettan (3 Seasons)						39.8															4
Allsvenskan (3 Seasons)						28.0															5
Serie A (1 Season)						0.3	19	21	90.5	207	73	17	18	94.4	2	3	66.7	0	0		0	0.0	0.0	0.0	0	2	0	0	1

Pass Types: Domestic Leagues

Pass Types: Domestic Leagues Table
								Pass Types								Corner Kicks			Outcomes
Season	Age	Squad	Country	Comp	LgRank	90s	Att	Live	Dead	FK	TB	Sw	Crs	TI	CK	In	Out	Str	Cmp	Off	Blocks	Matches
2019	18	Västerås	se SWE	2. Superettan	10th	0.2																Matches
2022	21	Örebro	se SWE	2. Superettan	10th	25.1																Matches
2023	22	Örebro	se SWE	2. Superettan	11th	14.5																Matches
2023	22	Djurgården	se SWE	1. Allsvenskan	4th	13.0							29									Matches
2024	23	Djurgården	se SWE	1. Allsvenskan	4th	15.0							60									Matches
2024-2025	24	Roma	it ITA	1. Serie A	12th	0.3	21	20	1	0	0	0	1	1	0	0	0	0	19	0	0	Matches
5 Seasons		5 Clubs		3 Leagues		68.1	21	20	1	0	0	0	90	1	0	0	0	0	19	0	0
			Country	Comp	LgRank	90s	Att	Live	Dead	FK	TB	Sw	Crs	TI	CK	In	Out	Str	Cmp	Off	Blocks	Matches
Örebro (2 Seasons)				1 League		39.6
Djurgården (2 Seasons)				1 League		28.0							89
Västerås (1 Season)				1 League		0.2
Roma (1 Season)				1 League		0.3	21	20	1	0	0	0	1	1	0	0	0	0	19	0	0
AIK Stockholm (1 Season)				1 League

Superettan (3 Seasons)						39.8
Allsvenskan (3 Seasons)						28.0							89
Serie A (1 Season)						0.3	21	20	1	0	0	0	1	1	0	0	0	0	19	0	0

Goal and Shot Creation: Domestic Leagues

Goal and Shot Creation: Domestic Leagues Table
							SCA		SCA Types						GCA		GCA Types
Season	Age	Squad	Country	Comp	LgRank	90s	SCA	SCA90	PassLive	PassDead	TO	Sh	Fld	Def	GCA	GCA90	PassLive	PassDead	TO	Sh	Fld	Def	Matches
2019	18	Västerås	se SWE	2. Superettan	10th	0.2																	Matches
2022	21	Örebro	se SWE	2. Superettan	10th	25.1																	Matches
2023	22	Örebro	se SWE	2. Superettan	11th	14.5																	Matches
2023	22	Djurgården	se SWE	1. Allsvenskan	4th	13.0																	Matches
2024	23	Djurgården	se SWE	1. Allsvenskan	4th	15.0																	Matches
2024-2025	24	Roma	it ITA	1. Serie A	12th	0.3	1	3.00	1	0	0	0	0	0	0	0.00	0	0	0	0	0	0	Matches
5 Seasons		5 Clubs		3 Leagues		68.1	1	3.00	1	0	0	0	0	0	0	0.00	0	0	0	0	0	0
			Country	Comp	LgRank	90s	SCA	SCA90	PassLive	PassDead	TO	Sh	Fld	Def	GCA	GCA90	PassLive	PassDead	TO	Sh	Fld	Def	Matches
Örebro (2 Seasons)				1 League		39.6
Djurgården (2 Seasons)				1 League		28.0
Västerås (1 Season)				1 League		0.2
Roma (1 Season)				1 League		0.3	1	3.00	1	0	0	0	0	0	0	0.00	0	0	0	0	0	0
AIK Stockholm (1 Season)				1 League

Superettan (3 Seasons)						39.8
Allsvenskan (3 Seasons)						28.0
Serie A (1 Season)						0.3	1	3.00	1	0	0	0	0	0	0	0.00	0	0	0	0	0	0

Defensive Actions: Domestic Leagues

Defensive Actions: Domestic Leagues Table
							Tackles					Challenges				Blocks
Season	Age	Squad	Country	Comp	LgRank	90s	Tkl	TklW	Def 3rd	Mid 3rd	Att 3rd	Tkl	Att	Tkl%	Lost	Blocks	Sh	Pass	Int	Tkl+Int	Clr	Err	Matches
2019	18	Västerås	se SWE	2. Superettan	10th	0.2																	Matches
2022	21	Örebro	se SWE	2. Superettan	10th	25.1																	Matches
2023	22	Örebro	se SWE	2. Superettan	11th	14.5																	Matches
2023	22	Djurgården	se SWE	1. Allsvenskan	4th	13.0		30											28				Matches
2024	23	Djurgården	se SWE	1. Allsvenskan	4th	15.0		34											18				Matches
2024-2025	24	Roma	it ITA	1. Serie A	12th	0.3	2	2	0	2	0	1	2	50.0	1	1	0	1	0	2	0	0	Matches
5 Seasons		5 Clubs		3 Leagues		68.1	2	66	0	2	0	1	2	50.0	1	1	0	1	46	2	0	0
			Country	Comp	LgRank	90s	Tkl	TklW	Def 3rd	Mid 3rd	Att 3rd	Tkl	Att	Tkl%	Lost	Blocks	Sh	Pass	Int	Tkl+Int	Clr	Err	Matches
Örebro (2 Seasons)				1 League		39.6														0
Djurgården (2 Seasons)				1 League		28.0		64											46	0
Västerås (1 Season)				1 League		0.2														0
Roma (1 Season)				1 League		0.3	2	2	0	2	0	1	2	50.0	1	1	0	1	0	2	0	0
AIK Stockholm (1 Season)				1 League																0

Superettan (3 Seasons)						39.8														0
Allsvenskan (3 Seasons)						28.0		64											46	0
Serie A (1 Season)						0.3	2	2	0	2	0	1	2	50.0	1	1	0	1	0	2	0	0

Possession: Domestic Leagues

Possession: Domestic Leagues Table
							Touches							Take-Ons					Carries								Receiving
Season	Age	Squad	Country	Comp	LgRank	90s	Touches	Def Pen	Def 3rd	Mid 3rd	Att 3rd	Att Pen	Live	Att	Succ	Succ%	Tkld	Tkld%	Carries	TotDist	PrgDist	PrgC	1/3	CPA	Mis	Dis	Rec	PrgR	Matches
2019	18	Västerås	se SWE	2. Superettan	10th	0.2																							Matches
2022	21	Örebro	se SWE	2. Superettan	10th	25.1																							Matches
2023	22	Örebro	se SWE	2. Superettan	11th	14.5																							Matches
2023	22	Djurgården	se SWE	1. Allsvenskan	4th	13.0																							Matches
2024	23	Djurgården	se SWE	1. Allsvenskan	4th	15.0																							Matches
2024-2025	24	Roma	it ITA	1. Serie A	12th	0.3	27	0	1	12	14	0	27	1	0	0.0	1	100.0	18	106	31	1	2	0	1	0	20	2	Matches
5 Seasons		5 Clubs		3 Leagues		68.1	27	0	1	12	14	0	27	1	0	0.0	1	100.0	18	106	31	1	2	0	1	0	20	2
			Country	Comp	LgRank	90s	Touches	Def Pen	Def 3rd	Mid 3rd	Att 3rd	Att Pen	Live	Att	Succ	Succ%	Tkld	Tkld%	Carries	TotDist	PrgDist	PrgC	1/3	CPA	Mis	Dis	Rec	PrgR	Matches
Örebro (2 Seasons)				1 League		39.6
Djurgården (2 Seasons)				1 League		28.0
Västerås (1 Season)				1 League		0.2
Roma (1 Season)				1 League		0.3	27	0	1	12	14	0	27	1	0	0.0	1	100.0	18	106	31	1	2	0	1	0	20	2
AIK Stockholm (1 Season)				1 League

Superettan (3 Seasons)						39.8
Allsvenskan (3 Seasons)						28.0
Serie A (1 Season)						0.3	27	0	1	12	14	0	27	1	0	0.0	1	100.0	18	106	31	1	2	0	1	0	20	2

Playing Time: Domestic Leagues

Playing Time: Domestic Leagues Table
							Playing Time				Starts			Subs			Team Success						Team Success (xG)
Season	Age	Squad	Country	Comp	LgRank	MP	Min	Mn/MP	Min%	90s	Starts	Mn/Start	Compl	Subs	Mn/Sub	unSub	PPM	onG	onGA	+/-	+/-90	On-Off	onxG	onxGA	xG+/-	xG+/-90	On-Off	Matches
2019	18	Västerås	se SWE	2. Superettan	10th	1	16	16	0.6	0.2	0		0	1	15	4	0.00	0	0	0	0.00	-0.03						Matches

2021	20	AIK Stockholm	se SWE	1. Allsvenskan	2nd	0					0			0		1												Matches
2022	21	Örebro	se SWE	2. Superettan	10th	27	2,260	84	83.7	25.1	25	86	16	2	55	0	1.15	23	28	-5	-0.20	-0.20						Matches
2023	22	Örebro	se SWE	2. Superettan	11th	15	1,305	87	48.3	14.5	15	87	12	0		0	1.07	14	18	-4	-0.28	-0.40						Matches
2023	22	Djurgården	se SWE	1. Allsvenskan	4th	13	1,166	90		13.0	13	90	11	0		0	1.54	16	14	+2	+0.15							Matches
2024	23	Djurgården	se SWE	1. Allsvenskan	4th	15	1,350	90	50.0	15.0	15	90	15	0		0	2.07	29	14	+15	+1.00	+1.33						Matches
2024-2025	24	Roma	it ITA	1. Serie A	12th	1	30	30	2.8	0.3	0		0	1	30	11	0.00	2	2	0	0.00	+0.26	0.3	0.6	-0.3	-1.05	-1.00	Matches
5 Seasons		5 Clubs		3 Leagues		72	6,127	85	34.0	68.1	68	88	54	4	39	16	1.36	84	76	+8	+0.12	+0.17	0.3	0.6	-0.3	-1.05	-1.00
			Country	Comp	LgRank	MP	Min	Mn/MP	Min%	90s	Starts	Mn/Start	Compl	Subs	Mn/Sub	unSub	PPM	onG	onGA	+/-	+/-90	On-Off	onxG	onxGA	xG+/-	xG+/-90	On-Off	Matches
Örebro (2 Seasons)				1 League		42	3,565	85	66.0	39.6	40	86	28	2	55	0	1.12	37	46	-9	-0.23	-0.33
Djurgården (2 Seasons)				1 League		28	2,516	90	50.0	28.0	28	90	26	0		0	1.82	45	28	+17	+0.61	+1.33
Västerås (1 Season)				1 League		1	16	16	0.6	0.2	0		0	1	15	4	0.00	0	0	0	0.00	-0.03
Roma (1 Season)				1 League		1	30	30	2.8	0.3	0		0	1	30	11	0.00	2	2	0	0.00	+0.26	0.3	0.6	-0.3	-1.05	-1.00
AIK Stockholm (1 Season)				1 League		0					0			0		1

Superettan (3 Seasons)						43	3,581	83	44.2	39.8	40	86	28	3	41	4	1.10	37	46	-9	-0.23	-0.29
Allsvenskan (3 Seasons)						28	2,516	90	25.0	28.0	28	90	26	0		1	1.82	45	28	+17	+0.61	+1.33
Serie A (1 Season)						1	30	30	2.8	0.3	0		0	1	30	11	0.00	2	2	0	0.00	+0.26	0.3	0.6	-0.3	-1.05	-1.00

Miscellaneous Stats: Domestic Leagues

Miscellaneous Stats: Domestic Leagues Table
							Performance													Aerial Duels
Season	Age	Squad	Country	Comp	LgRank	90s	CrdY	CrdR	2CrdY	Fls	Fld	Off	Crs	Int	TklW	PKwon	PKcon	OG	Recov	Won	Lost	Won%	Matches
2019	18	Västerås	se SWE	2. Superettan	10th	0.2	0	0	0									0					Matches
2022	21	Örebro	se SWE	2. Superettan	10th	25.1	2	0	0									0					Matches
2023	22	Örebro	se SWE	2. Superettan	11th	14.5	1	0	0									0					Matches
2023	22	Djurgården	se SWE	1. Allsvenskan	4th	13.0	2	0	0	8	11	1	29	28	30			0					Matches
2024	23	Djurgården	se SWE	1. Allsvenskan	4th	15.0	1	0	0	10	21	0	60	18	34			0					Matches
2024-2025	24	Roma	it ITA	1. Serie A	12th	0.3	0	0	0	1	0	0	1	0	2	0	0	0	0	0	0		Matches
5 Seasons		5 Clubs		3 Leagues		68.1	6	0	0	19	32	1	90	46	66	0	0	0	0	0	0
			Country	Comp	LgRank	90s	CrdY	CrdR	2CrdY	Fls	Fld	Off	Crs	Int	TklW	PKwon	PKcon	OG	Recov	Won	Lost	Won%	Matches
Örebro (2 Seasons)				1 League		39.6	3	0	0									0
Djurgården (2 Seasons)				1 League		28.0	3	0	0	18	32	1	89	46	64			0
Västerås (1 Season)				1 League		0.2	0	0	0									0
Roma (1 Season)				1 League		0.3	0	0	0	1	0	0	1	0	2	0	0	0	0	0	0
AIK Stockholm (1 Season)				1 League

Superettan (3 Seasons)						39.8	3	0	0									0
Allsvenskan (3 Seasons)						28.0	3	0	0	18	32	1	89	46	64			0
Serie A (1 Season)						0.3	0	0	0	1	0	0	1	0	2	0	0	0	0	0	0

About FBref.com

FBref.com launched (June 13, 2018) with domestic league coverage for England, France, Germany, Italy, Spain, and United States. Since then we have been steadily expanding our coverage to include domestic leagues from over 40 countries as well as domestic cup, super cup and youth leagues from top European countries. We have also added coverage for major international cups such as the UEFA Champions League and Copa Libertadores.

FBref is the most complete sources for women's football data on the internet. This includes the entire history of the FIFA Women's World Cup as well as recent domestic league seasons from nine countries, including advanced stats like xG for most of those nine.

In collaboration with Opta, we are including advanced analytical data such as xG, xA, progressive passing, duels and more for over twenty competitions. For more information on the expected goals model and which competitions have advanced data, see our xG explainer.

Note that player records are likely not complete for their careers. Players may come from or move to leagues we don't currently cover. This issue will go down over time, as we add new leagues and seasons. We will never in the future have less data than we do today.

You can sign up to receive an e-mail when new countries and features launch.

For more information, see our Launch Blog Post, the overall leagues/competition page with details on leagues and seasons we include, or our About Page. Let us know if you find an issue or have a suggestion.

FBref is one of seven Sports-Reference.com sites.