Dyfyniad APA

Hepple, P. Lead in the environment.

Dyfyniad Arddull Chicago

Hepple, Peter. Lead in the Environment.

Dyfyniad MLA

Hepple, Peter. Lead in the Environment.

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