Παραπομπή APA

Thormbury, W. D. (1969). Principles of geomorphology (2nd ed.). Wiley Eastern.

Παραπομπή Chicago Style

Thormbury, William D. Principles of Geomorphology. 2nd ed. New York: Wiley Eastern, 1969.

Παραπομπή MLA

Thormbury, William D. Principles of Geomorphology. 2nd ed. Wiley Eastern, 1969.