See the article “The Cathari — Were They Christian Martyrs? ” in the September 1, 1995, issue of The Watchtower, published by Jehovah’s Witnesses, pages 27 - 30.
Vaata artiklit „Katarid – kas nad olid kristlikud märtrid? ”,„ Vahitorn ”, 1. september 1995, lk 27 – 30; väljaandjad Jehoova tunnistajad.