Cita APA (7th ed.)

THORNBURY, W. D. (1969). Principles of geomorphology.-- Ed.2. John Wiley and Sons.

Cita Chicago (17th ed.)

THORNBURY, William D. Principles of Geomorphology.-- Ed.2. New York: John Wiley and Sons, 1969.

Cita MLA (9th ed.)

THORNBURY, William D. Principles of Geomorphology.-- Ed.2. John Wiley and Sons, 1969.