- FamilySe
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 28 Jun 2016), entry for Sydney De Villiers Krog, person ID MCNP-91B.
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 28 Jun 2016), entry for Sydney de Villiers Krog, person ID LHXS-YRC.
» Bronnen » Stamboom M. Tolsma » Genealogie Online">
- FamilySe
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 28 Jun 2016), entry for Sydney De Villiers Krog, person ID MCNP-91B.
- FamilySearch Family Tree (http://www.familysearch.org) - "FamilySearch," database, \i FamilySearch\i0 - The Church of Jesus Christ of Latter-day Saints - accessed 28 Jun 2016), entry for Sydney de Villiers Krog, person ID LHXS-YRC.
» Bronnen » Stamboom M. Tolsma » Genealogie Online">