@book{311,
	author = {Fowler, Floyd J.},
	title = {Survey research methods /},
	publisher = {Sage Publications,},
	year = {c2009.},
	address = {Thousand Oaks :},
	edition = {4th ed.},
	url = {http://www.loc.gov/catdir/toc/ecip0814/2008011835.html}
}