@book {9783402191545, 
	title = "Kölnische Liturgie und ihre Geschichte",
	author = "Gerhards, Albert",
	isbn = "9783402191545",
	url = "http://www.content-select.com/index.php?id=bib_view&ean=9783402191545",
	url = "https://content-select.com/de/portal/media/view/60421701-e5c0-49e0-ac46-5a28b0dd2d03",
	publisher = "Aschendorff Verlag",
	language = "ger",
}