Dyfyniad APA

Bennett, J. O. (2009). The essential cosmic perspective (5th edition.). Addison-Wesley.

Dyfyniad Arddull Chicago

Bennett, Jeffrey O. The Essential Cosmic Perspective. 5th edition. San Francisco: Addison-Wesley, 2009.

Dyfyniad MLA

Bennett, Jeffrey O. The Essential Cosmic Perspective. 5th edition. Addison-Wesley, 2009.

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