Dyfyniad APA

Stavins,Robert N. (2012). Economics of the Environment (6th.). Norton.

Dyfyniad Arddull Chicago

Stavins,Robert N. Economics of the Environment. 6th. New York: Norton, 2012.

Dyfyniad MLA

Stavins,Robert N. Economics of the Environment. 6th. Norton, 2012.

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