- FamilySearc
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 10 Jun 2016), entry for Robert de Vermandois, person ID 94TD-KJP.
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 10 Jun 2016), entry for Robert de VERMANDOIS, person ID 9M9H-VF7.
» 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 10 Jun 2016), entry for Robert de Vermandois, person ID 94TD-KJP.
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 10 Jun 2016), entry for Robert de VERMANDOIS, person ID 9M9H-VF7.
» Les sources » Arbre généalogique M. Tolsma » Généalogie Online">