@book{17634,
	author = {Sengupta, S. and Bhattacharya, S. and Bhattacharya, S. ; jt. auth.},
	title = {Commutation in West Bengal; findings of a survey},
	publisher = {Indian Statistical Institute},
	year = {1968},
	series = {NSS technical paper no. 21},
	address = {Calcutta}
}