Census of India,1971 <br/><br/>
Economical tables .Andhra Pradesh V.2, Pt. 2B. 

 - Andhra Pradesh   Govt. Press          1971 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Dewey Class. No.: </label>Y:5.216sN71, L1.2-2B