Dyfyniad APA

Richard Adams (Great Neck Publishing). Great Neck Publishing.

Dyfyniad Arddull Chicago

Richard Adams (Great Neck Publishing). Great Neck Publishing.

Dyfyniad MLA

Richard Adams (Great Neck Publishing). Great Neck Publishing.

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