Census of India, 1981 <br/><br/>
Handicraft survey report lapidary work. Kerala. V. 10, Pt. X D 

 - Kerala  Govt. Press           1981 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Dewey Class. No.: </label>Y:5.212sN81, M1.10-10-D