FamilySearch (https://familysearch.org/pal:/MM9.1.1/VZS4-XYP : accessed 02 Aug 2014), Heinrich Langenberg and Odilia Servos, 11 Oct 1871; citing Civil, Dormagen, Rheinland, Prussia; FHL microfilm 939292. » Quellen » Familienstammbaum Servaes, Maastricht/Venlo/Straelen/Neuss/Düsseldorf » Genealogie Online"> FamilySearch (https://familysearch.org/pal:/MM9.1.1/VZS4-XYP : accessed 02 Aug 2014), Heinrich Langenberg and Odilia Servos, 11 Oct 1871; citing Civil, Dormagen, Rheinland, Prussia; FHL microfilm 939292. » Quellen » Familienstammbaum Servaes, Maastricht/Venlo/Straelen/Neuss/Düsseldorf » Genealogie Online">