Dyfyniad APA

Cunnigham William P. (2005). Environmental science: A global concern. McGraw Hill.

Dyfyniad Arddull Chicago

Cunnigham William P. Environmental Science: A Global Concern. London: McGraw Hill, 2005.

Dyfyniad MLA

Cunnigham William P. Environmental Science: A Global Concern. McGraw Hill, 2005.

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