Dyfyniad APA

.Cullingworth, J. B. (1990). Energy, land, and public policy. Transaction Publishers.

Dyfyniad Arddull Chicago

.Cullingworth, J. B. Energy, Land, and Public Policy. New Brunswick, U.S.A.: Transaction Publishers, 1990.

Dyfyniad MLA

.Cullingworth, J. B. Energy, Land, and Public Policy. Transaction Publishers, 1990.

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