- FamilySearc
- 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 Helen Malvina Ahrens, person ID L6D5-FQN.
- 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 Helen Malvina Ahrens, person ID M59L-343.
» 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 29 Jun 2016), entry for Helen Malvina Ahrens, person ID L6D5-FQN.
- 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 Helen Malvina Ahrens, person ID M59L-343.
» Quellen » Familienstammbaum M. Tolsma » Genealogie Online">