Dyfyniad APA

Gilluly James, Waters Aaron, & Woodford, A. (1968). Principles of geology (Third edition.). Ms. Rowan.

Dyfyniad Arddull Chicago

Gilluly James, Waters Aaron, and A.O Woodford. Principles of Geology. Third edition. San Francisco: Ms. Rowan, 1968.

Dyfyniad MLA

Gilluly James, et al. Principles of Geology. Third edition. Ms. Rowan, 1968.

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