THIRKETTLE, G. L. <br/><br/>
Weldon's Business Statistics and Statistical Method 

 - 9th ed. 
 - London  ELBS/ Pitman Publishers  1986 
 - ix, 278p. 
<br/><br/><label>ISBN: </label>0-273-02696-8 
<br/><br/><label>Dewey Class. No.: </label>650