Cochran, William G <br/><br/>
Sampling techniques 

 - 3rd ed 
 - Wiley Eastern Ltd., New Delhi  1977 
 - xvi, 428 
<br/><br/><label>ISBN: </label>0-85226-121-7 
<br/><br/><label>Dewey Class. No.: </label>311.21 Coc