APA (7th ed.) Citation

Thornbury, W. D. (1969). Principles of geomorphology (2. ed.). Wiley.

Chicago Style (17th ed.) Citation

Thornbury, William D. Principles of Geomorphology. 2. ed. New York [u.a.]: Wiley, 1969.

MLA (9th ed.) Citation

Thornbury, William D. Principles of Geomorphology. 2. ed. Wiley, 1969.