APA (7th ed.) Zitazioa

Heller, R. L. (1979). Earth science (2d ed.). Webster Division, McGraw-Hill.

Chicago Style (17th ed.) Zitazioa

Heller, Robert L. Earth Science. 2d ed. New York: Webster Division, McGraw-Hill, 1979.

MLA (9th ed.) Zitazioa

Heller, Robert L. Earth Science. 2d ed. Webster Division, McGraw-Hill, 1979.