Dyfyniad APA

Freedman, B. (2001). Environmental science: A Canadian perspective. Prentice Hall.

Dyfyniad Arddull Chicago

Freedman, Bill. Environmental Science: A Canadian Perspective. Toronto: Prentice Hall, 2001.

Dyfyniad MLA

Freedman, Bill. Environmental Science: A Canadian Perspective. Prentice Hall, 2001.

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