Business mathematics 
By N.K. Nag 
 - 3rd ed. 
 - Ludhiana:  Kalyani publishers,  1988. 
 - viii,426p. 
<br/><br/><label>ISBN: </label>81-7096-095-9 
<br/><br/><label>Subjects--Index Terms: </label>Mathematics Business mathematics 
<br/><br/><label>Dewey Class. No.: </label>510