APA (7th ed.) Citation

Hoad, R., & Moore, P. (2012). The world's toughest endurance challenges. Bloomsbury Publishing.

Chicago Style (17th ed.) Citation

Hoad, Richard, and Paul Moore. The World's Toughest Endurance Challenges. London: Bloomsbury Publishing, 2012.

MLA (8th ed.) Citation

Hoad, Richard, and Paul Moore. The World's Toughest Endurance Challenges. Bloomsbury Publishing, 2012.