Koop, J., & Rutberg, J. (2016). Training essentials for ultrarunning: How to train smarter, race faster, and maximize your ultramarathon performance. VeloPress.
Цитирование в стиле Чикаго (17-е изд.)Koop, Jason, и Jim Rutberg. Training Essentials for Ultrarunning: How to Train Smarter, Race Faster, and Maximize Your Ultramarathon Performance. Boulder, Colorado: VeloPress, 2016.
Цитирование MLA (8-е изд.)Koop, Jason, и Jim Rutberg. Training Essentials for Ultrarunning: How to Train Smarter, Race Faster, and Maximize Your Ultramarathon Performance. VeloPress, 2016.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.