- FamilySear
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 28 Jun 2016), entry for Jacoba Maria de Jager, person ID KGCF-57S.
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 28 Jun 2016), entry for Jacoba Elisabeth De Jager, person ID 2CBR-V35.
» Quellen » Familienstammbaum M. Tolsma » Genealogie Online">
- FamilySear
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 28 Jun 2016), entry for Jacoba Maria de Jager, person ID KGCF-57S.
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 28 Jun 2016), entry for Jacoba Elisabeth De Jager, person ID 2CBR-V35.
» Quellen » Familienstammbaum M. Tolsma » Genealogie Online">