Cengage <br/><br/>
Science And Technology For UPSC and State Civil Services Examinations / 
Cengage 
 - Delhi:  Cengage,  2019. 
 - 233p 
<br/><br/><label>ISBN: </label>9789386668875 
<br/><br/><label>Dewey Class. No.: </label>501  / CEN/S