Dyfyniad APA

Heller,Robert, Johnson,Roy, Holden, R., Eaton,John, & Renshaw,Ben. (2008). Achieving excellence. Dorling Kindersley.

Dyfyniad Arddull Chicago

Heller,Robert, Johnson,Roy, Robert Holden, Eaton,John, and Renshaw,Ben. Achieving Excellence. London: Dorling Kindersley, 2008.

Dyfyniad MLA

Heller,Robert, et al. Achieving Excellence. Dorling Kindersley, 2008.

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