Cita APA (7th ed.)

Thornbury, W. D. (1969). Principles Geomorphology. Wiley.

Cita Chicago (17th ed.)

Thornbury, William David. Principles Geomorphology. New York: Wiley, 1969.

Cita MLA (9th ed.)

Thornbury, William David. Principles Geomorphology. Wiley, 1969.