APA (7th ed.) Zitazioa

Gardner, J. S. (1977). Physical Geography. Harper's Pr..

Chicago Style (17th ed.) Zitazioa

Gardner, James S. Physical Geography. New York: Harper's Pr., 1977.

MLA (9th ed.) Zitazioa

Gardner, James S. Physical Geography. Harper's Pr., 1977.