@book{14808,
	author = {GRAVETTER, FREDERICK J.},
	title = {Research methords for the behavioral sciences /},
	publisher = {THOMSON LEARNING,},
	year = {2011.},
	address = {[S.l.] :},
	url = {http://www.amazon.com/exec/obidos/ASIN/0534197663/chopaconline-20}
}