Sinha, Ajay Kumar; Chakraborty, Gorky; Bhattacharya, Chandana; Datta, P. S. (2004). "Assam". In Agnihotri, V. K. (ed.). Socio-economic Profile of Rural India (in ஆங்கிலம்). Vol. Volume II: North-East India (Assam, Manipur, Tripura, Nagaland). New Delhi: Concept Publishing Company. p. 16. ISBN9788180691454. {{cite book}}: |volume= has extra text (help)