Dyfyniad APA

 Rogers, P. P. (2008).  An introduction to sustainable development.  Earthscan.

Dyfyniad Arddull Chicago

 Rogers, Peter P.  An Introduction to Sustainable Development.  Earthscan, 2008.

Dyfyniad MLA

 Rogers, Peter P.  An Introduction to Sustainable Development.  Earthscan, 2008.

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