@book{36,
	author = {Yin, Robert K.},
	title = {Case study research :},
	publisher = {Sage Publications,},
	year = {c1994.},
	address = {Thousand Oaks :},
	edition = {2nd ed.},
	url = {http://www.loc.gov/catdir/enhancements/fy0655/93040567-d.html}
}