Author: Jasbir Singh
Publisher:Vishal Publications, Kurukshetra
Copyright:1976
Author: Birnie, Arthur
Publisher:Methuen & Co. Ltd., London
Copyright:1944
Author: Jaffar, S. M.
Publisher:Ganavani Publishing House, Calcutta
Copyright:1944
Author: Law,Bimala Churn
Publisher:Bharatiya Publishing House, Delhi
Copyright:1976
Author: Verma, T.P.
Publisher:Nabajiban Press
Copyright:1976
Author: Gai, G.S. Rao, N. Lakshminarayan
Publisher:The Director General, Archaeological Survey of India, New Delhi
Copyright:1976
Author: Grimes, W.F.
Publisher:H.W. Edwards, London
Copyright:1951
Author: Thomson, R. C. Muirhead
Publisher:"Luzac and Company Ltd , London"
Copyright:1944
Author: Mukherjee, Syama Prasad
Publisher:Ramesh Chandra Banerjee, Calcutta
Copyright:1944