- 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 Walravina Mechteld Baroness Van Boetzelaer, person ID 9SZS-995.
- 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 Walravinne Machteld van Boetzelaer, person ID LDMC-3NC.
» Quellen » Familienstammbaum M. Tolsma » Genealogie Online">
- 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 Walravina Mechteld Baroness Van Boetzelaer, person ID 9SZS-995.
- 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 Walravinne Machteld van Boetzelaer, person ID LDMC-3NC.
» Quellen » Familienstammbaum M. Tolsma » Genealogie Online">