APA (7th ed.) Zitazioa

Foster, R. J. (1979). Physical geology. Charles E.Merrill.

Chicago Style (17th ed.) Zitazioa

Foster, Robert J. Physical Geology. Columbus: Charles E.Merrill, 1979.

MLA (9th ed.) Zitazioa

Foster, Robert J. Physical Geology. Charles E.Merrill, 1979.