@book{188873,
	author = {Spiegel, Murray R. and Stephens, Larry J.},
	title = {Schaum's outline Statistics /},
	publisher = {McGraw-Hill,},
	year = {c2018},
	series = {Schaum's outline series},
	address = {New York :},
	edition = {6th ed. /},
	url = {http://www.loc.gov/catdir/bios/mh041/98046602.html}
}