Dyfyniad APA

Montgomery, C. W. (1989). Environmental geology/2nd ed (2nd ed.). WMC Brown.

Dyfyniad Arddull Chicago

Montgomery, Carla W. Environmental Geology/2nd Ed. 2nd ed. USA: WMC Brown, 1989.

Dyfyniad MLA

Montgomery, Carla W. Environmental Geology/2nd Ed. 2nd ed. WMC Brown, 1989.

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