Research methods in the social sciences 
Nachmias, Chava Frankfort. 
 - Sixth edition. 
 -  Worth Publishers.  2000 
 - xxi, 550 pages. 
<br/><br/>
<br/><br/><label>ISBN: </label>1-57259-794-1 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social sciences -- Methodology.
<br/><br/><label>Dewey Class. No.: </label>GS 300.7221 N11r 2000