@book{23255,
	author = {Levy, Paul S. and Lemeshow, Stanley.},
	title = {Sampling of populations },
	publisher = {Wiley },
	year = {c1999.},
	series = {Wiley series in probability and statistics.},
	address = {New York },
	edition = {3a ed.},
	note = {"Wiley-Interscience publication."}
}