Dyfyniad APA

Davis, M. L. (2004). Principles of environmental engineering and science. New York, NY: McGraw-Hill.

Dyfyniad Arddull Chicago

Davis, Mackenziel Leo. Principles of Environmental Engineering and Science. New York, NY: McGraw-Hill, 2004.

Dyfyniad MLA

Davis, Mackenziel Leo. Principles of Environmental Engineering and Science. New York, NY: McGraw-Hill, 2004.

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