Cita APA (7th ed.)

Gillaly, J. (1968). Principles of geology. W. H. Freeman.

Cita Chicago (17th ed.)

Gillaly, James. Principles of Geology. San Francisco: W. H. Freeman, 1968.

Cita MLA (9th ed.)

Gillaly, James. Principles of Geology. W. H. Freeman, 1968.