Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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