Dyfyniad APA

Tyler, M., & Spoolman, S. (2008). Environmental science: Problems, concepts, and solutions (12th ed.). Thomson.

Dyfyniad Arddull Chicago

Tyler, Miller, and Scott Spoolman. Environmental Science: Problems, Concepts, and Solutions. 12th ed. Australia: Thomson, 2008.

Dyfyniad MLA

Tyler, Miller, and Scott Spoolman. Environmental Science: Problems, Concepts, and Solutions. 12th ed. Thomson, 2008.

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