1. John A. Ledingham and Stephen D. Bruning, “Background and Current Trends in the Study of Public Relations as Relationship Management,” in John A. Ledingham and Stephen D. Bruning (eds.), Public Relations as Relationship Management: A Relational Approach to the Study and Practice of Public Relations (Mahwah, NJ: Lawrence Erlbaum Associates, in press-a).
2. Introduction to the Paradigm Struggle in Public Relations;Botan;Public Relations Review,1993
3. Career Paths in Public Relations;Cardwell,1997
4. John A. Ledingham and Stephen D. Bruning, op. cit.