APA (7th ed.) Zitazioa

Worcester, P. G. (1969). Textbook of geomorphology (2nd ed.). Van Nostrand.

Chicago Style (17th ed.) Zitazioa

Worcester, Philip G. Textbook of Geomorphology. 2nd ed. New york: Van Nostrand, 1969.

MLA (9th ed.) Zitazioa

Worcester, Philip G. Textbook of Geomorphology. 2nd ed. Van Nostrand, 1969.