@book{36020,
	author = {India. National Sample Survey Office},
	title = {NSS 23th round : July 1968-June 1969 ; Instructions},
	publisher = {The Authors},
	year = {1968},
	address = {Calcutta},
	edition = {Rev.},
	note = {Contents: v.1. Desing, concepts, definitions and procedures}
}