APA (7th ed.) Zitazioa

Gresswell,. (1967). Physical geography. Frederick A. Praeger.

Chicago Style (17th ed.) Zitazioa

Gresswell. Physical Geography. New York: Frederick A. Praeger, 1967.

MLA (9th ed.) Zitazioa

Gresswell. Physical Geography. Frederick A. Praeger, 1967.