- 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 Berthe Bertrade, person ID 9HRZ-4MK.
- FamilySearch Fam
- 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 Berthe Bertrade, person ID 9HRZ-4MK.
- 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 Bertrada Countess Of Laon, person ID 9C6K-2MK.
- 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 Bertruda of Laon, person ID 94JL-GRL.
- 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 Bertrade "Broadfoot" de Laon, person ID 9MCW-PFL.
- 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 Bertrada Queen of France, person ID 9HRG-VQV.
- 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 Bertrada Queen of of France, person ID 9H5V-66V.
- 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 Bertrada Laon, person ID MBJ9-X31.
- 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 Bertrada Broadfoot De Laon, person ID M127-84R.
- 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 Bertrada Countess of Queen of Franks Laon, person ID 94RZ-N1J.
- 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 BERTRADE 'Bertha Broadfoot' of De Laon, person ID 9M8V-SS6.
- 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 Berthe Bertrade Countess of Laon, person ID 9HYJ-W2W.
- 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 Bertrada Queen of France, person ID 9C69-GX6.
- 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 Bertrada Laon, person ID 9H1V-QH5.
- 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 Bertrada Countess Of Laon, person ID 9ZCW-G6P.
- 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 Bertrada Countess of of Laon, person ID 9CQH-MZ3.
- 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 Bertrada Queen of France, person ID 9H1Z-1ZZ.
- 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 Bertrada Countess Of Laon, person ID 9Z88-SQH.
- 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 Bertrada Queen of France, person ID 941Y-8B2.
- 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 Bertrada Broadfoot de Laon, person ID 9CNJ-YC8.
- 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 Bertrada Queen Of Laon, person ID 99KR-KV4.
- 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 Bertrada Broadfoot de Laon, person ID 9HL2-LVS.
- 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 Bertrada France, person ID 9CHJ-5VL.
- 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 Bertrada Laon, person ID M1SK-TFN.
- 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 Bertrada Queen of France, person ID 9HYX-8S5.
- 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 Bertrade of Laon, person ID 9H7M-DBY.