Dyfyniad APA

Cutlip, S. M., & Center, A. H. (1978). Effective public relations (5th ed.). Prentice-Hall.

Dyfyniad Arddull Chicago

Cutlip, Scott M., and Allen H. Center. Effective Public Relations. 5th ed. Englewood Cliffs, N.J: Prentice-Hall, 1978.

Dyfyniad MLA

Cutlip, Scott M., and Allen H. Center. Effective Public Relations. 5th ed. Prentice-Hall, 1978.

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