Biology: Textbook for class xi 

 - Reprint /   2013. 
 - Delhi:  Offices of thr publication Division, NCERT,  2013. 
 - 342. 
<br/><br/><label>Subjects--Personal Names: </label><br/>Biology, Lifescience. 
<br/><br/><label>Subjects--Index Terms: </label>Life sciences biology 
<br/><br/><label>Dewey Class. No.: </label>570