Dyfyniad APA

Raven, P. H., & Berg, L. R. (2004). Environment (4th ed.). John Wiley & Sons.

Dyfyniad Arddull Chicago

Raven, Peter H., and Linda R. Berg. Environment. 4th ed. John Wiley & Sons, 2004.

Dyfyniad MLA

Raven, Peter H., and Linda R. Berg. Environment. 4th ed. John Wiley & Sons, 2004.

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