Dyfyniad APA

Miller, G., & Spoolman, S. E. (2010). Environmental science (13th ed.). Brooks/Cole.

Dyfyniad Arddull Chicago

Miller, G.Tyler, and Scott E. Spoolman. Environmental Science. 13th ed. Belmont: Brooks/Cole, 2010.

Dyfyniad MLA

Miller, G.Tyler, and Scott E. Spoolman. Environmental Science. 13th ed. Brooks/Cole, 2010.

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