Please use the following reading :
Mukherjee, Kunal, ‘India’s Fractured North-eastern Frontier: An Overview’, Asia Pacific Review, 2014.

Mukherjee, Kunal., ‘The Conflict in the Indian Northeast’, Defence Studies: Journal of Military and Strategic Studies, 2014.

S.Dutt, ‘Identities and the Indian State: an Overview’, Third World Quarterly, 19(3), 1998.

P.Brass, Ethnicity and Nationalism, Theory and Comparison, London: Sage, 1991.

C.Singh, North East India: Politics and Insurgency, 2007.