Dyfyniad APA

Simmons, I. (1989). Changing the face of the earth: Culture, environment, history. Basil Blackwell.

Dyfyniad Arddull Chicago

Simmons, I.G. Changing the Face of the Earth: Culture, Environment, History. Cambridge, Mass.: Basil Blackwell, 1989.

Dyfyniad MLA

Simmons, I.G. Changing the Face of the Earth: Culture, Environment, History. Basil Blackwell, 1989.

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