"Deutschland Heiraten, 1558-1929," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:JH4L-CYS : 11 February 2018), Hubertus Bilk and Christina Dackweiler, 09 Jan 1876; citing Katholisch, Dormagen, Rheinland, Prussia; FHL microfilm 174,328.