@book{90893,
	author = {Perkins, Walter Morris,},
	title = {Simple methods for representative sampling in studies of public assistance case loads,},
	year = {1944.},
	series = {[U.S.] Bureau of Public Assistance. Public assistance research memorandum},
	address = {[Washington]},
	note = {At head of title: Federal Security Agency, Social Security Board.}
}