Public relations : theory and practice 
de la Cruz, R.R. 
 - 1992 revised edition. 
 -  R.R. de la Cruz.  1975 
 - XVI, 444 pages. 
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<br/><br/><label>ISBN: </label>9-71914310-X 
<br/><br/><label>Dewey Class. No.: </label>F 659.2 C88p 1975