Uchhatar madhyamik banijyik patiganit aru prathamik parishankhya vigyan 
By N.K. Nag 
 - 3rd ed. 
 - Ludhiana:  Kalyani publishers,  1998. 
 - viii,537p. 
<br/><br/><label>ISBN: </label>81-7096-185-8 
<br/><br/><label>Subjects--Index Terms: </label>Arithmetic Business mathematics & statistics 
<br/><br/><label>Dewey Class. No.: </label>513