Environment for civil services preliminary examinations/ 
Jha,Sachchida Nand 
 - 1st.ed. 
 - Delhi:  UPSC portal pub.,  2012. 
 - 295 
<br/><br/><label>ISBN: </label>9789381362341 
<br/><br/><label>Dewey Class. No.: </label>351.076  / JHA/E