Dyfyniad APA

Cunningham, W. P. (1997). Environmental science: A global concern (4th.ed.). Wm.C.Brown.

Dyfyniad Arddull Chicago

Cunningham, William P. Environmental Science: A Global Concern. 4th.ed. Dubuque: Wm.C.Brown, 1997.

Dyfyniad MLA

Cunningham, William P. Environmental Science: A Global Concern. 4th.ed. Wm.C.Brown, 1997.

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