Tài liệu tham khảo WikiPedia: Gary_Speed http://vnexpress.net/gl/the-thao/bong-da/2011/11/g... http://www.guardian.co.uk/football/2011/nov/27/gar... http://www.telegraph.co.uk/news/obituaries/sport-o... http://dantri.com.vn/c26/s26-542064/hlv-dt-xu-wale... http://dantri.com.vn/c26/s26-542145/cuoc-doi-va-su... http://laodong.com.vn/Tin-Tuc/Cuu-danh-thu-Gary-Sp... http://www.tienphong.vn/The-Thao/559390/Gary-Speed... https://web.archive.org/web/20111128201657/http://...
