APA (7th ed.) Zitazioa

Shelton, J. S. (1966). Geology illustrated. W. H. Freeman.

Chicago Style (17th ed.) Zitazioa

Shelton, John S. Geology Illustrated. San Francisco: W. H. Freeman, 1966.

MLA (9th ed.) Zitazioa

Shelton, John S. Geology Illustrated. W. H. Freeman, 1966.