Dyfyniad APA

Ritter, D. F., & Kochel, R. C. M. (2002). Process geomorphology (4th ed.). Mc Graw hill.

Dyfyniad Arddull Chicago

Ritter, Dale F., and R. Craig Miller Kochel. Process Geomorphology. 4th ed. Boston: Mc Graw hill, 2002.

Dyfyniad MLA

Ritter, Dale F., and R. Craig Miller Kochel. Process Geomorphology. 4th ed. Mc Graw hill, 2002.

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