Dyfyniad APA

Hatch, F., Wells, A. K., & Wills, M. K. (1972). Petrology of the igneous rocks (13th ed.). Allen and Unwin.

Dyfyniad Arddull Chicago

Hatch, F.H., A. K. Wells, and M. K. Wills. Petrology of the Igneous Rocks. 13th ed. London: Allen and Unwin, 1972.

Dyfyniad MLA

Hatch, F.H., et al. Petrology of the Igneous Rocks. 13th ed. Allen and Unwin, 1972.

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