Dyfyniad APA

Sewell,W R Derrck. (1974). Environmental quality. Sage Sage Publications Ltd.

Dyfyniad Arddull Chicago

Sewell,W R Derrck. Environmental Quality. London: Sage Sage Publications Ltd, 1974.

Dyfyniad MLA

Sewell,W R Derrck. Environmental Quality. Sage Sage Publications Ltd, 1974.

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