NCERT <br/><br/>
Mathematics  : textbook for class Vii 
/ by NCERT 
 - New delhi  NCERT  2017 
 - 312 
<br/><br/><label>ISBN: </label>978-81-7450-669-1 
<br/><br/><label>Dewey Class. No.: </label>510   / N213M