Census of India, 1961 <br/><br/>
Cultural and migration tables. Kerala. V. 7, Part II C 

 - Kerala  Govt. Press           1961 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Dewey Class. No.: </label>Y:5.2121sN61, K1.7-11C