Dyfyniad APA

Skinner,Brain J. (1969). Earths History, Stucture and Materials (10th ed.). WILLIAM KAUFMANN.

Dyfyniad Arddull Chicago

Skinner,Brain J. Earths History, Stucture and Materials. 10th ed. California: WILLIAM KAUFMANN, 1969.

Dyfyniad MLA

Skinner,Brain J. Earths History, Stucture and Materials. 10th ed. WILLIAM KAUFMANN, 1969.

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