Cochran, William G. <br/><br/>
Sampling techniques, 3rd edition / 
Cochran, William G. 
 - [S.l.] :  Wiley,  1977 
 - 428 p. ; 
<br/><br/><label>ISBN: </label>047116240X (paperback) | 97804 
<br/><br/><label>Dewey Class. No.: </label>001.433 C659 S