@book{40812,
	author = {Shaughnessy, John J., and Zechmeister, Eugene B.,},
	title = {Research methods in psychology /},
	publisher = {Mc Graw Hill,},
	year = {c2003.},
	address = {Burr Ridge, IL :},
	edition = {6th ed.},
	note = {Includes index.}
}