APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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