Dyfyniad APA

Hill , M. K. (1997). Understanding environmental pollution. University press.

Dyfyniad Arddull Chicago

Hill , Marquita K. Understanding Environmental Pollution. Cambridge: University press, 1997.

Dyfyniad MLA

Hill , Marquita K. Understanding Environmental Pollution. University press, 1997.

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