Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.