"Deutschland Heiraten, 1558-1929," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:J4GY-45B : 11 February 2018), Christian Proepper and Catharina Coellen, 11 Feb 1755; citing Sankt Peter Katholisch, Uerdingen, Rheinland, Prussia; FHL microfilm 176,074.