Science text book for class IX 
National Council of Education Research and Training 
 - First edition 
 - New Delhi  [publisher not identified]  2012 
 - 218 
<br/><br/><label>ISBN: </label>8174504923 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science
<br/><br/><label>Dewey Class. No.: </label>500 NCERT