- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 27 Jun 2016), entry for Constance Alfonsez Princess of Castile, person ID 9CCS-V29.
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 27 Jun 2016), entry for Constance Alfonsez Princess Castile, person ID 9C32-B7G.
» 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 27 Jun 2016), entry for Constance Alfonsez Princess of Castile, person ID 9CCS-V29.
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 27 Jun 2016), entry for Constance Alfonsez Princess Castile, person ID 9C32-B7G.
» Quellen » Familienstammbaum M. Tolsma » Genealogie Online">