WETHERILL, G.Barrie <br/><br/>
ELEMENTARY STATISTICAL METHODS 

 - 3rd Ed. 
 - London  Chapman and Hall Limited, London   1982 
<br/><br/><label>ISBN: </label>0 412 2400 9 
<br/><br/><label>Dewey Class. No.: </label>519.5  / WET/E