@book{13021,
	author = {Hanushek, Eric A. and Jackson, John Edgar,},
	title = {Statistical methods for social scientists /},
	publisher = {Academic Press,},
	year = {c1977.},
	series = {Quantitative studies in social relations},
	address = {New York :},
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/description/els031/76009158.html}
}