@book{58047,
	author = {International Union for the Scientific Study of Population. and United Nations.},
	title = {Variables and questionnaire for comparative fertility surveys /},
	publisher = {United Nations,},
	year = {1970.},
	series = {Population studies, ST/SOA/ser.A/45.},
	address = {New York,},
	note = {"United Nations publication. Sales no.: E.69.XIII.4."}
}