@book{6880,
	author = {Creswell, John W.},
	title = {Research design :},
	publisher = {Sage Publications,},
	year = {c2009.},
	address = {Thousand Oaks, Calif. :},
	edition = {3rd ed.},
	url = {http://www.loc.gov/catdir/toc/ecip0810/2008006242.html}
}