- FamilySearc
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 13 Jun 2016), entry for Mechtild von Sachsen, person ID LHK8-QQ4.
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 13 Jun 2016), entry for MATILDA Billung, person ID LZGK-HJ2.
» Les sources » Arbre généalogique M. Tolsma » Généalogie Online">
- FamilySearc
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 13 Jun 2016), entry for Mechtild von Sachsen, person ID LHK8-QQ4.
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 13 Jun 2016), entry for MATILDA Billung, person ID LZGK-HJ2.
» Les sources » Arbre généalogique M. Tolsma » Généalogie Online">