Kerlinger, F N <br/><br/>
Behavioral research: A conceptual approach 
by Fred N Kerlinger 
 - New York  Holt. Rineman & Wivslon  1979 
<br/><br/><label>ISBN: </label>00301333319 
<br/><br/><label>Dewey Class. No.: </label>150.72 KER/BEH