@book{972,
	author = {Cochran, William Gemmell,},
	title = {Sampling techniques /},
	publisher = {Wiley,},
	year = {c1977.},
	series = {Wiley series in probability and mathematical statistics},
	address = {New York :},
	edition = {3d ed.},
	note = {Includes indexes.},
	url = {http://www.loc.gov/catdir/description/wiley037/77000728.html}
}