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 27 Jun 2016), entry for Dirk Iv Count Holland, person ID KNSQ-CYM.
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- 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 Dirk Iv Count Holland, person ID KNSQ-CYM.
- 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 Dirk IV, person ID LWN4-WS1.
- 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 Dirk Iv, Count Holland, person ID 2RJ9-79B.
- 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) Dirk IV, Count HOLLAND, person ID KPS1-L11.
- 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 Dirk IV Count of Holland, person ID LH7S-1G7.

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L'information de cette source

• Naissance de Dirk Iv Dirk Iv, Count Holland (1015)
• Naissance de Dirk Iv Dirk Iv, Count Holland (1015)
• Décès de Dirk Iv Dirk Iv, Count Holland (19 janvier 1049)
• Décès de Dirk Iv Dirk Iv, Count Holland (19 janvier 1049)

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