Thirkettle, G L <br/><br/>
Wheldon`s Business Statistics And Statistical Method / 
G L Thirkettle 
 - 7th ed. 
 - London:  The English Language Book Society,  1972. 
 - 242p 
<br/><br/><label>ISBN: </label>0712102299 
<br/><br/><label>Dewey Class. No.: </label>519.502465  / THI/W