Dyfyniad APA

Cunningham, W. P. (2008). Principles of environmental science: Inquiry & applications. New York: McGraw-Hill.

Dyfyniad Arddull Chicago

Cunningham, William P. Principles of Environmental Science: Inquiry & Applications. New York: McGraw-Hill, 2008.

Dyfyniad MLA

Cunningham, William P. Principles of Environmental Science: Inquiry & Applications. New York: McGraw-Hill, 2008.

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