FamilySearch (https://familysearch.org/pal:/MM9.1.1/NFTC-NBG : accessed 16 Nov 2014), Franz Joseph Servaes in entry for Friedrich Jacob Servaes, ; citing DUESSELDORF STADT,RHEINLAND,PRUSSIA; FHL microfilm 939313. » Quellen » Familienstammbaum Servaes, Maastricht/Venlo/Straelen/Neuss/Düsseldorf » Genealogie Online"> FamilySearch (https://familysearch.org/pal:/MM9.1.1/NFTC-NBG : accessed 16 Nov 2014), Franz Joseph Servaes in entry for Friedrich Jacob Servaes, ; citing DUESSELDORF STADT,RHEINLAND,PRUSSIA; FHL microfilm 939313. » Quellen » Familienstammbaum Servaes, Maastricht/Venlo/Straelen/Neuss/Düsseldorf » Genealogie Online">