APA (7th ed.) Zitazioa

American Geological Institute. (1972). Investigating the earth. Houghton Mifflin.

Chicago Style (17th ed.) Zitazioa

American Geological Institute. Investigating the Earth. New York: Houghton Mifflin, 1972.

MLA (9th ed.) Zitazioa

American Geological Institute. Investigating the Earth. Houghton Mifflin, 1972.