Dyfyniad APA

(2002). The good in nature and humanity. Island Press.

Dyfyniad Arddull Chicago

The Good in Nature and Humanity. Island Press, 2002.

Dyfyniad MLA

The Good in Nature and Humanity. Island Press, 2002.

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