@book{6048,
	author = {Cohen, Jacob,},
	title = {Statistical Power Analysis for the Behavioral Sciences /},
	publisher = {L. Erlbaum Associates,},
	year = {1988.},
	address = {Hillsdale, N.J. :},
	edition = {2nd ed.},
	note = {Includes index.},
	url = {http://www.loc.gov/catdir/enhancements/fy0731/88012110-d.html}
}