Dyfyniad APA

Cunningham, W. P. (1999). Environmental encyclopedia (2nd ed.). Gale, Jaico Publishing House.

Dyfyniad Arddull Chicago

Cunningham, William P. Environmental Encyclopedia. 2nd ed. Detroit : Mumbai: Gale, Jaico Publishing House, 1999.

Dyfyniad MLA

Cunningham, William P. Environmental Encyclopedia. 2nd ed. Gale, Jaico Publishing House, 1999.

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