@book{66548,
	author = {Mitchell, Mark L. and Jolley, Janina M.},
	title = {Research design explained /},
	publisher = {Wadsworth Cengage Learning,},
	year = {2013},
	address = {Belmont, CA :},
	edition = {8th ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy1215/2011941997-t.html}
}