- FamilySearc
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 14 Jun 2016), entry for Gertrude De Flanders, person ID MYG4-ZPR.
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 14 Jun 2016), entry for Gertrude De Flanders, person ID LHW4-78X.
» Quellen » Familienstammbaum M. Tolsma » Genealogie Online">
- FamilySearc
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 14 Jun 2016), entry for Gertrude De Flanders, person ID MYG4-ZPR.
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 14 Jun 2016), entry for Gertrude De Flanders, person ID LHW4-78X.
» Quellen » Familienstammbaum M. Tolsma » Genealogie Online">