Dyfyniad APA

Miller, G. T. (1991). Environmental science sustaining the earth (3rd ed.). Wadsworth.

Dyfyniad Arddull Chicago

Miller, G. Tyler. Environmental Science Sustaining the Earth. 3rd ed. Belmont: Wadsworth, 1991.

Dyfyniad MLA

Miller, G. Tyler. Environmental Science Sustaining the Earth. 3rd ed. Wadsworth, 1991.

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