Dyfyniad APA

American (19328117). American Enterprise Institute for Public Policy Research.

Dyfyniad Arddull Chicago

American (19328117). American Enterprise Institute for Public Policy Research.

Dyfyniad MLA

American (19328117). American Enterprise Institute for Public Policy Research.

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