Tài liệu tham khảo WikiPedia: Duncan_Ferguson http://www.nufc.com/html/sundaytimes_ferguson.html http://www.premierleague.com/page/Statistics/0,,12... http://www.soccerbase.com/players/player.sd?player... http://www.toffeeweb.com/players/past/Ferguson.asp https://www.imdb.com/name/nm3621488/ https://web.archive.org/web/20061231043746/http://... https://www.wikidata.org/wiki/Q465623#P2193 https://www.wikidata.org/wiki/Q465623#P345
