Arbre généalogique M. Tolsma » Les sources »
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0   - The Church of Jesus Christ of Latter-day Saints - accessed 10 Sep 2016), entry for Helena " Britannica" of Constantinople, person ID LH73-B5M.
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0   - The Church of Jesus Christ of Latter-day Saints - accessed 10 Sep 2016), entry for Helena " Britannica" of Constantinople, person ID LH73-B5M.
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0   - The Church of Jesus Christ of Latter-day Saints - accessed 10 Sep 2016), entry for Helena " Britannica" of Constantinople, person ID LH7S-G3M.

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- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0   - The Church of Jesus Christ of Latter-day Saints - accessed 10 Sep 2016), entry for Helena " Britannica" of Constantinople, person ID LH73-B5M.
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0   - The Church of Jesus Christ of Latter-day Saints - accessed 10 Sep 2016), entry for Helena " Britannica" of Constantinople, person ID LH73-B5M.
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0   - The Church of Jesus Christ of Latter-day Saints - accessed 10 Sep 2016), entry for Helena " Britannica" of Constantinople, person ID LH7S-G3M.


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