Dyfyniad APA

Polunin, M. (1979). Minerals: What they are and why we need them. Thorsons.

Dyfyniad Arddull Chicago

Polunin, Miriam. Minerals: What They Are and Why We Need Them. Wellingborough: Thorsons, 1979.

Dyfyniad MLA

Polunin, Miriam. Minerals: What They Are and Why We Need Them. Thorsons, 1979.

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