Dwivede Prabhakar <br/><br/>
Vishwakosh kya kyon aur kaise? 
NCERT 
 - New Delhi, India  Rashtriya Sheshik Anusandhan aur Prashikshan Parishad   1965 
 - 52p. 
<br/><br/><label>Source: </label>Books to be hide in OPAC