Dyfyniad APA

Raven, P. H., Hassenzahi, D. M., & Bery, L. R. (2013). Environment (8th ed.). Wiley.

Dyfyniad Arddull Chicago

Raven, Peter H., David M. Hassenzahi, and Linda R. Bery. Environment. 8th ed. New Jersey: Wiley, 2013.

Dyfyniad MLA

Raven, Peter H., et al. Environment. 8th ed. Wiley, 2013.

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