Cochran, William G.  <br/><br/>
Sampling Techniques   Third Edition  
William G. Cochran  
 - New Delhi:   Wiley eastern Limited,  1977. 
 - xvi,428p. 
<br/><br/><label>ISBN: </label>0852261217 
<br/><br/><label>Dewey Class. No.: </label>519.52  / COC/S