By Kalpataru Biswal <br/><br/>
OPSC General Studies 
Biswal Kalpataru 
 - New Delhi  Salween Publisher  2023 
 - 400 p. 
<br/><br/><label>ISBN: </label>9789384409425 
<br/><br/><label>Dewey Class. No.: </label>000  / BIS