Babbie, Earl <br/><br/>
The Practice of Social Research 

 - 3rd ed 
 - Wadsworth, Belmont  1983 
 - xxiv; 551 
<br/><br/><label>ISBN: </label>0-534-01255-8 
<br/><br/><label>Dewey Class. No.: </label>307.2 Bab