APA (7th ed.) Citation

Adams, A., & Newhall, N. (1968). This is the American earth. Sierra Club.

Chicago Style (17th ed.) Citation

Adams, Ansel, and Nancy Newhall. This Is the American Earth. San Francisco: Sierra Club, 1968.

MLA (9th ed.) Citation

Adams, Ansel, and Nancy Newhall. This Is the American Earth. Sierra Club, 1968.