APA (7th ed.) Citation

Gilluly, J., Waters, A. C., & Woodford, A. O. (1968). Principles of geology (3.ed.). Freeman.

Chicago Style (17th ed.) Citation

Gilluly, James, Aaron Clement Waters, and Alfred Oswald Woodford. Principles of Geology. 3.ed. San Francisco: Freeman, 1968.

MLA (9th ed.) Citation

Gilluly, James, et al. Principles of Geology. 3.ed. Freeman, 1968.