Dyfyniad APA

Miller, G. T., & Spoolman, S. E. (2013). Environmental science (14th edition.). Cengage Learning.

Dyfyniad Arddull Chicago

Miller, G. Tyler, and Scott E. Spoolman. Environmental Science. 14th edition. Andover: Cengage Learning, 2013.

Dyfyniad MLA

Miller, G. Tyler, and Scott E. Spoolman. Environmental Science. 14th edition. Cengage Learning, 2013.

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