@book{3630,
	author = {Scheaffer, Richard L.},
	title = {Elementary survey sampling /},
	publisher = {Brooks/Cole, Cengage Learning,},
	year = {c2012.},
	series = {Advanced series},
	address = {Boston, MA :},
	edition = {7th ed.},
	note = {Rev. ed. of: Elementary survey sampling / Richard L. Scheaffer, William Mendenhall III, R. Lyman Ott. 6th ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy1303/2010939138-b.html}
}