@book{113671,
	author = {Patton, Michael Quinn. and Patton, Michael Quinn.},
	title = {Qualitative evaluation and research methods},
	publisher = {Sage Publications},
	year = {c1990.},
	address = {Newbury Park, Calif.},
	edition = {2nd ed.},
	note = {Rev. ed. of: Qualitative evaluation methods. c1980.}
}