1. Otto Lerbinger, “Public Affairs Study Guide and Bibliography, ” New York: Public Affairs Section, Public Relations Society of America 845 Third Ave., New York, N.Y. 10022.
2. Managing Public Relations;Grunig,1984
3. “The Statement of Mexico”, First World Assembly of Public Relations Associations,1980
4. Effective Public Relations;Cutlip,1982
5. Grunig and Hunt, (1984), p. 52.