Cutlip, Scott M. <br/><br/>
Effective Public Relations / 
Scott M. Cutlip, Allen H. Center, Glen M. Broom. 
 - Sixth Edition. 
 - Englewood Cliffs, N.J. :  Prentice-Hall,  1985. 
 - xviii, 670 p. :  ill. ;  25 cm.