@book{838,
	author = {Spector, Paul E.},
	title = {SAS programming for researchers and social scientists /},
	publisher = {Sage Publications,},
	year = {c1993.},
	address = {Newbury Park :},
	url = {http://www.loc.gov/catdir/enhancements/fy0655/92046399-d.html}
}