APA (7th ed.) Citation

Muir, J., Brower, D., & Kauffman, R. (1967). Gentle wilderness: The Sierra Nevada. Sierra Club.

Chicago Style (17th ed.) Citation

Muir, John, David Brower, and Richard Kauffman. Gentle Wilderness: The Sierra Nevada. San Francisco: Sierra Club, 1967.

MLA (9th ed.) Citation

Muir, John, et al. Gentle Wilderness: The Sierra Nevada. Sierra Club, 1967.