Παραπομπή APA

Worcester, P. G. (1948). Textbook of geomorphology (2nd ed.). Van Nostrand Reinhold Company.

Παραπομπή Chicago Style

Worcester, Philip G. Textbook of Geomorphology. 2nd ed. New York: Van Nostrand Reinhold Company, 1948.

Παραπομπή MLA

Worcester, Philip G. Textbook of Geomorphology. 2nd ed. Van Nostrand Reinhold Company, 1948.