@book{54191,
	author = {Sinha, Surajit, and Centre for Studies in Social Sciences.},
	title = {Tribal polities and state systems in pre-colonial eastern and north eastern India /},
	publisher = {Published for Centre for Studies in Social Sciences, Calcutta, by K.P. Bagchi & Co.,},
	year = {1987.},
	address = {Calcutta :}
}