Dyfyniad APA

Allen, J. L. (2004). Environment 04/05 (Twenty-third edition.). Mcgraw-Hill/Dushkin.

Dyfyniad Arddull Chicago

Allen, J. L. Environment 04/05. Twenty-third edition. Dubuque, Iowa: Mcgraw-Hill/Dushkin, 2004.

Dyfyniad MLA

Allen, J. L. Environment 04/05. Twenty-third edition. Mcgraw-Hill/Dushkin, 2004.

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