Census of India, 1981 <br/><br/>
Handicraft survey report, carpet craft of obra village. Bihar.V. 4, Pt. X-D 

 - Bihar  Govt Press           1981 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Dewey Class. No.: </label>Y:5.273sN81, M1.4-X-D