APA (7th ed.) Citation

Karnazes & Fitzgerald. (2008). 50/50: Secrets I learned running 50 marathons in 50days--and how you too can achieve super endurance. Wellness Central.

Chicago Style (17th ed.) Citation

Karnazes and Fitzgerald. 50/50: Secrets I Learned Running 50 Marathons in 50days--and How You Too Can Achieve Super Endurance. New York: Wellness Central, 2008.

MLA (9th ed.) Citation

Karnazes and Fitzgerald. 50/50: Secrets I Learned Running 50 Marathons in 50days--and How You Too Can Achieve Super Endurance. Wellness Central, 2008.

Warning: These citations may not always be 100% accurate.