History of the relations of the government with the Hill Tribes of the North-East Frontier of Bengal. By Alexander Mackenzie, Secretary to the Government of India in the Home Department Calcutta: Govt of India Home Dept, 1884
Report (topographical, political, and military) on the North-East Frontier of India. By Cpt St John F Michell, Intelligence Branch, Quarter Master General's Dept in India Calcutta: Quarter Master General's Dept, 1883