@book{23784,
	author = {National-Galerie (Germany) and Jordan, Max.},
	title = {Katalog der Königlichen national-galerie zu Berlin,},
	publisher = {E.S. Mittler & Sohn,},
	year = {1885-},
	address = {[Berlin]},
	edition = {7. vervollständigte Aufl. ...}
}