Dyfyniad APA

Wright, R. T. (2011). Environmental Science: Toward a Sustainable Future. Boston: Benjamin Cummings.

Dyfyniad Arddull Chicago

Wright, Richard T. Environmental Science: Toward a Sustainable Future. Boston: Benjamin Cummings, 2011.

Dyfyniad MLA

Wright, Richard T. Environmental Science: Toward a Sustainable Future. Boston: Benjamin Cummings, 2011.

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