@book{97381,
	author = {Gravetter, Frederick J. and Forzano, Lori-Ann B.},
	title = {Understanding research methods for the behavioral sciences /},
	publisher = {Cengage Learning Asia,},
	year = {2012.},
	address = {Philippines :},
	edition = {2nd edition.},
	note = {Includes glossary and index.}
}