- Fami
- 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 Pieter Ryno Johannes Nielen, person ID M5HF-C88.
- 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 Pieter Ryno Johannes Nielen, person ID 2CBT-2DQ.
» Quellen » Familienstammbaum M. Tolsma » Genealogie Online">
- Fami
- 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 Pieter Ryno Johannes Nielen, person ID M5HF-C88.
- 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 Pieter Ryno Johannes Nielen, person ID 2CBT-2DQ.
» Quellen » Familienstammbaum M. Tolsma » Genealogie Online">