APA-referens (7:e uppl.)

Thornbury, W. D. (1965). Regional geomorphology of the United States. Wiley.

Chicago-referens (17:e uppl.)

Thornbury, William D. Regional Geomorphology of the United States. New York: Wiley, 1965.

MLA-referens (8:e uppl.)

Thornbury, William D. Regional Geomorphology of the United States. Wiley, 1965.