@book{62668,
	author = {Marshall, Catherine and Rossman, Gretchen B.},
	title = {Designing qualitative research},
	publisher = {Sage Publ.},
	year = {2011},
	address = {Los Angeles, Calif. [u.a.]},
	edition = {5. ed.},
	note = {Literaturverz. S. 279 - 299}
}