Cochran, William G. <br/><br/>
Sampling Techniques 
/by 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  / COH/S