Baal gyan kosh :  Vigyan aur hum / 
Edited by Anil Kumar Singh 
 - Delhi :  Alka publications,  2009. 
<br/><br/><br/>In Hindi 
<br/><br/><label>ISBN: </label>9788190578493 
<br/><br/><label>Subjects--Index Terms: </label>Scientific Facts - Encyclopedia