- holycrossoca.org newslet/1005.html
- sacred-destinations.com turkey/istanbul-church-of…
- famouswonders.com church-of-the-holy-apostles/
- archive.org details/holy-martyrs-of-gorcum-church
- http://romeofthewest.com 2005/12/photos-of-church-of-…
- nelmitravel.com the-holy-cross-church-in-warsaw-…
- pravoslavie.ru 35861.html