1. Adams, F. D.Canadian Jour. of Research, 1929,1, 425–511.
2. BhadauriaQ.J.M.G.M. Soc. India, 1943.
3. Chaterjee, S. C.Ibid.,, 1929,2, 17.
4. Crookshank, H.Rec. G.S.I., 1938,73, 398–433.
5. Fermor, L. L.Proc. As. Soc. Beng., 1919, N. S. 15, cixx-cxcv.