- FamilySearch Fami
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 10 Jun 2016), entry for Douwe Poelstra, person ID 9W1Y-MTG.
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 10 Jun 2016), entry for Douwe Poelstra, person ID 9N1D-T4V.
» Quellen » Familienstammbaum M. Tolsma » Genealogie Online">
- FamilySearch Fami
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 10 Jun 2016), entry for Douwe Poelstra, person ID 9W1Y-MTG.
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 10 Jun 2016), entry for Douwe Poelstra, person ID 9N1D-T4V.
» Quellen » Familienstammbaum M. Tolsma » Genealogie Online">