Janak Singh <br/><br/>
Mazahib-e-Alam aur Mojuda sciency daur (Urdu) 

 - Chandigarh  Tarlochan pub.  2015 
<br/><br/><label>ISBN: </label>9788179147221 
<br/><br/><label>Dewey Class. No.: </label>294.5  J251M