Mathematics 
By N.K. Nag 
 - Ludhiana:  Kalyani publishers,  2003. 
 - x,625p. 
<br/><br/><label>ISBN: </label>978-81-272-4659-4 
<br/><br/><label>Subjects--Index Terms: </label>Commerce Mathematics 
<br/><br/><label>Dewey Class. No.: </label>510