Pryavaran adhyyan : Aas - pas : Chauthi kaksha ke liye pathya pustak 
NCERT (New Delhi India) 
 - New Delhi, India  National Council Educational Research and Training  2007 
 - xii,216p 
<br/><br/><label>ISBN: </label>81-7450-692-6 
<br/><br/><label>Source: </label>Reference 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental Education