APA (7th ed.) Citation

Thornbury, W. D. (1969). Principles of geomorphology. John Wiley & Sons.

Chicago Style (17th ed.) Citation

Thornbury, William D. Principles of Geomorphology. New York: John Wiley & Sons, 1969.

MLA (9th ed.) Citation

Thornbury, William D. Principles of Geomorphology. John Wiley & Sons, 1969.

Warning: These citations may not always be 100% accurate.