@book {9783781553781, 
	title = "Methodologie und Methoden der Schulbuch- und Lehrmittelforschung",
	isbn = "9783781553781",
	edition = "1",
	url = "http://www.content-select.com/index.php?id=bib_view&ean=9783781553781",
	url = "https://content-select.com/de/portal/media/view/5510236d-0ab8-4902-81aa-0f44b0dd2d03",
	publisher = "Verlag Julius Klinkhardt",
}