Dyfyniad APA

Allen, J. L. (2008). Annual editions: Environment 07/08 (Twenty-sixth edition.). McGraw-Hill/Dushkin.

Dyfyniad Arddull Chicago

Allen, John L. Annual Editions: Environment 07/08. Twenty-sixth edition. Dubuque, IA: McGraw-Hill/Dushkin, 2008.

Dyfyniad MLA

Allen, John L. Annual Editions: Environment 07/08. Twenty-sixth edition. McGraw-Hill/Dushkin, 2008.

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