APA (7th ed.) Citation

Gale Group, Booth, D., & Thorpe, H. (2007). Berkshire encyclopedia of extreme sports. Berkshire Publishing Group.

Chicago Style (17th ed.) Citation

Gale Group, Douglas Booth, and Holly Thorpe. Berkshire Encyclopedia of Extreme Sports. Great Barrington, Mass: Berkshire Publishing Group, 2007.

MLA (9th ed.) Citation

Gale Group, et al. Berkshire Encyclopedia of Extreme Sports. Berkshire Publishing Group, 2007.