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 13 Jun 2016), entry for Valthiofr of Tynedale Sigurðrsson, person ID LK5S-T96.

- 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 Valthiofr of Tynedale Sigurðrsson, person ID LK5S-T96.
- 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) Waltheof Ii, person ID 94PB-R1C.

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• Décès de Valthiofr Of Tynedale Waltheof Ii (31 mai 1076)
• Décès de Valthiofr Of Tynedale Waltheof Ii (31 mai 1076)

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