Dyfyniad APA

Wright Richard T. (2011). Environmental science: Toward a sustainable future. PHI Learning.

Dyfyniad Arddull Chicago

Wright Richard T. Environmental Science: Toward a Sustainable Future. New Delhi: PHI Learning, 2011.

Dyfyniad MLA

Wright Richard T. Environmental Science: Toward a Sustainable Future. PHI Learning, 2011.

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