Thirkettle, G. L. <br/><br/>
Wheldon's Business statistics and statistical method. 

 - 9th ed. 
 - Plymouth :  Macdonald and Evans,  1976. 
 - ix, 278 p. :  ill., forms, maps 
<br/><br/> Cover title: Wheldon's business statistics. 
<br/><br/><label>ISBN: </label>0712123253 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Statistics.