Cita APA (7th ed.)

Gilluly, J., Waters, A. C., & Woodford, A. O. (1975). Principles of geology (4th ed.). W. H. Freeman.

Cita Chicago (17th ed.)

Gilluly, James, Aaron Clement Waters, i Alfred O. Woodford. Principles of Geology. 4th ed. San Francisco: W. H. Freeman, 1975.

Cita MLA (9th ed.)

Gilluly, James, et al. Principles of Geology. 4th ed. W. H. Freeman, 1975.