Census of India, 1981 <br/><br/>
General economic tables & social and cultural tables. Sikkim. V. 19, Pt. 3 A & B & 4-A 

 - Sikkim  Govt Press           1981 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Dewey Class. No.: </label>Y:5.2973sN81, M1.19-3A&B & 4-A