Dyfyniad APA

Derbyshire, E. D., Gregory, K. J., & Hails, J. (1979). Geomorphological processess. Wm Dawson & Sons, Ltd.

Dyfyniad Arddull Chicago

Derbyshire, Edward D., Kenneth John Gregory, and J.R Hails. Geomorphological Processess. Boulder, Colorado: Wm Dawson & Sons, Ltd, 1979.

Dyfyniad MLA

Derbyshire, Edward D., et al. Geomorphological Processess. Wm Dawson & Sons, Ltd, 1979.

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