Cutlip, S. M., Center, A. H., & Broom, G. M. Effective public relations (7th ed.). New Jersey: Prentice Hall International,*c1994.

Cutlip, Scot M., Allen H. Center, and Glen M. Broom. Effective Public Relations. 7th ed. New Jersey: Prentice Hall International,*c1994.

Cutlip, Scot M., Allen H. Center, and Glen M. Broom. Effective Public Relations. 7th ed. New Jersey: Prentice Hall International,*c1994.