APA (7th ed.) Citation

Gilluly, J., Waters, A. C., & Woodford, A. O. (1960). Principles of geology (2. ed.). Freeman.

Chicago Style (17th ed.) Citation

Gilluly, James, Aaron Clement Waters, and Alfred Oswald Woodford. Principles of Geology. 2. ed. San Francisco [u.a.]: Freeman, 1960.

MLA (9th ed.) Citation

Gilluly, James, et al. Principles of Geology. 2. ed. Freeman, 1960.