Babbie, Earl <br/><br/>
The Practice of Social Research / 
by Earl Babbie  
 - 10th Ed. 
 - United States of America:  Wadsworth Thomsaon Learning,  2004 
 - p.491 
<br/><br/><label>ISBN: </label>0534620280 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social sciences, sociology & anthropology <br/>Social sciences <br/>Education And Research <br/>Social sciences--research
<br/><br/><label>Dewey Class. No.: </label>300.72  / BAB-P