Dyfyniad APA

Wright, R. T. (2004). Environmental science: Toward a sustainable future. PHI.

Dyfyniad Arddull Chicago

Wright, Richard T. Environmental Science: Toward a Sustainable Future. New Delhi: PHI, 2004.

Dyfyniad MLA

Wright, Richard T. Environmental Science: Toward a Sustainable Future. PHI, 2004.

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