Dyfyniad APA

Miller, G. T. (1997). Environmental science: Working with the earth (6th ed.). Wadsworth.

Dyfyniad Arddull Chicago

Miller, G. Tyler. Environmental Science: Working with the Earth. 6th ed. Belmont: Wadsworth, 1997.

Dyfyniad MLA

Miller, G. Tyler. Environmental Science: Working with the Earth. 6th ed. Wadsworth, 1997.

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