@book{210394,
	author = {Morgan, George A.},
	title = {SPSS for introductory statistics},
	publisher = {Lawrence Erlbaum},
	year = {c2007.},
	address = {Mahwah, NJ},
	edition = {3. ed.},
	note = {ESTE LIBRO CONTIENE UN DISCO},
	url = {http://www.loc.gov/catdir/enhancements/fy0629/2004040383-d.html}
}