Dyfyniad APA

Cunningham, W. P. (2001). Environmental science: A global concern (6th edition.). McGraw-Hill.

Dyfyniad Arddull Chicago

Cunningham, William P. Environmental Science: A Global Concern. 6th edition. New York: McGraw-Hill, 2001.

Dyfyniad MLA

Cunningham, William P. Environmental Science: A Global Concern. 6th edition. McGraw-Hill, 2001.

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