Aakalan srot pustika: Prathmik ster ki kakshaon ke liye 
NCERT 
 - New Delhi, India  National Council of Educational Research and Training  2008 
 - iii, 88p. 
<br/><br/><label>ISBN: </label>978-81-7450-857-7 
<br/><br/><label>Source: </label>Textual