- Family
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 29 Jun 2016), entry for Johanna Gerhardina Nielen, person ID M5HF-CDD.
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 29 Jun 2016), entry for Johanna Gerhardina Nielen, person ID 2CBT-2DV.
» Les sources » Arbre généalogique M. Tolsma » Généalogie Online">
- Family
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 29 Jun 2016), entry for Johanna Gerhardina Nielen, person ID M5HF-CDD.
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 29 Jun 2016), entry for Johanna Gerhardina Nielen, person ID 2CBT-2DV.
» Les sources » Arbre généalogique M. Tolsma » Généalogie Online">