APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

Thornbury, W. D. Principles of Geomorphology / by W.D. Thornbury. 2nd ed. Wiley, 1969.

MLA (9th ed.) Citation

Thornbury, W. D. Principles of Geomorphology / by W.D. Thornbury. 2nd ed. Wiley, 1969.

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