G.L.Thirkettle <br/><br/>
Wheldon's business statistics and statistical methods / 
Thirkettle L.G. 
 - 9th edition. 
 - London :  Pitman,  1981. 
 - 278p. : 
<br/><br/>includes index. 
<br/><br/><label>ISBN: </label>0273026968 
<br/><br/><label>LC Class. No.: </label>HA 29   / .T45 1981