Singh, Parikshit Kumar  <br/><br/>
Audhyogik sharm sangathan / 
Parikshit Kumar Singh 
 - New Delhi:  Educational Book Service,   2018. 
 - 171 p. 
<br/><br/><label>ISBN: </label>9789386541260 
<br/><br/><label>Dewey Class. No.: </label>331.7  / SIN