APA (7th ed.) Citation

Coburn, B., Breashears, D., & Cahill, T. (1997). Everest: Mountain without mercy. National Geographic Society.

Chicago Style (17th ed.) Citation

Coburn, Broughton, David Breashears, and Tim Cahill. Everest: Mountain Without Mercy. [Washington, D.C.]: National Geographic Society, 1997.

MLA (8th ed.) Citation

Coburn, Broughton, et al. Everest: Mountain Without Mercy. National Geographic Society, 1997.