Cochran, William G. <br/><br/>
Sampling techniques / 
William G. Cochran. 
 - 1st ed. 
 - [S.l.] :  Wiley,  1960. 
 - 330 p. 
<br/><br/> Paperback. 
<br/><br/><label>ISBN: </label>9971512718 9789971512712