タフガイ・チャレンジ
↑ To Hell and back, for a crack at the title of toughest nut, By Richard Smith, 26 January 1998, The Independent
↑ The toughest race on earth, By John Triggs, Jan 31, 2008, Express.co.uk
↑ “The Bad Boy Running Podcast: Ep44 - James Appleton talks Tough Guy, fell running, Bob Graham Round and being a photographer”. badboyrunningpodcast.com. 2017年4月25日閲覧。
↑ “The Bad Boy Running Podcast: Ep42 - The Final Tough Guy and Marathon Training”. badboyrunningpodcast.com. 2017年4月25日閲覧。
↑ https://www.toughguy.co.uk/
Episode of Beste Belg ('Best Belgian') program on VTM (Flemish commercial TV), 2005, entering presenter Staff Coppens's brother Matthias
An article from Jim Caple of ESPN, recounting his attempt at Tough Guy 2007 - http://sports.espn.go.com/espn/eticket/story?page=toughguy2007
2010 Results can be found at https://web.archive.org/web/20100208170429/http://www.tdl.ltd.uk/
toughguy.co.uk - 公式サイト