- FamilySea
- 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 Pierre II de Courtenay, person ID KF2Y-7SF.
- 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 Clemence De Courtenay, person ID LCVF-CQK.
- 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 Pierre III De Courtenay Emperor of Constantinople, person ID 9H8D-1WX.
» Quellen » Familienstammbaum M. Tolsma » Genealogie Online">
- FamilySea
- 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 Pierre II de Courtenay, person ID KF2Y-7SF.
- 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 Clemence De Courtenay, person ID LCVF-CQK.
- 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 Pierre III De Courtenay Emperor of Constantinople, person ID 9H8D-1WX.
» Quellen » Familienstammbaum M. Tolsma » Genealogie Online">