@book{199638,
	author = {Marshall, Catherine. and Rossman, Gretchen B.},
	title = {Designing qualitative research},
	publisher = {Sage Publications},
	year = {c2006.},
	address = {Thousands Oaks, Calif.},
	edition = {4th ed.},
	url = {http://www.loc.gov/catdir/toc/ecip0519/2005026958.html}
}