Backstrom, Charles H <br/><br/>
Survey research 

 - 2nd ed. 
 - New York  John Wiley  1981 
 - xxii, 436 p. 
<br/><br/><label>ISBN: </label> RS14.95 
<br/><br/><label>Dewey Class. No.: </label>301.1543 B128S