Stafford, L. W. T. <br/><br/>
Business mathematics / 
L.W.T. Stafford 
 - 2nd ed. 
 - Plymouth :  Macdonald and Evans,  1979 
 - xiv, 384 p. :  ill. ;  18 cm. 
<br/><br/><label>ISBN: </label>0712102825 (pbk.)