Dyfyniad APA

Hayes, D. C., Hendrix, J. A., & Kumar, P. D. (2013). Public relations cases (9th ed.). Wadsworth/Cengage Learning.

Dyfyniad Arddull Chicago

Hayes, Darrell C., Jerry A. Hendrix, and Pallavi D. Kumar. Public Relations Cases. 9th ed. Australia: Wadsworth/Cengage Learning, 2013.

Dyfyniad MLA

Hayes, Darrell C., et al. Public Relations Cases. 9th ed. Wadsworth/Cengage Learning, 2013.

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