Babbie, Earl R. <br/><br/>
The practice of social research / 
Earl R. Babbie. 
 - 2nd. ed. 
 - Carlifornia :  Wadsworth,  1979. 
 - 596 p. 
<br/><br/><label>ISBN: </label>0534006302 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Social science research.<br/>Social sciences- methodology.
<br/><br/><label>LC Class. No.: </label>H 62  / .B2