APA (7th ed.) Zitazioa

Foster, R. J. (1983). General geology. Charles E. Merrill.

Chicago Style (17th ed.) Zitazioa

Foster, Robert J. General Geology. Columbus: Charles E. Merrill, 1983.

MLA (9th ed.) Zitazioa

Foster, Robert J. General Geology. Charles E. Merrill, 1983.