1. ^{{cite book |last=|first= |author-link=|year=1898 |editor-last= |editor-first= |contribution= |title=The Key of Truth, a Manual of the Paulician Church of Armenia, The Armenian Text, Edited and Translated with Illustrative Documents and Introduction by Fred. C. Conybeare, Formerly Fellow of University College Oxford |edition= 1 |publisher=Clarendon Press |publication-place= Oxford |pages= |url=https://archive.org/details/keyoftruthmanual00paul |accessdate= 23 January 2017}}
2. ^Encyclopedia of Religion and Ethics Part 18 - Page 695 James Hastings, John A. Selbie - 2003 "The possible exception is The Key of Truth, which was discovered by FC Conybeare, translated from the Armenian,... It is a manual of ' Thondrakian ' or Paulician teaching and practice, mutilated unfortunately by the removal of almost a ..."
3. ^Contra Patarenos Page 33 Hugh Eteriano, Janet Hamilton, Sarah Hamilton - 2004 "146 In 1898 FC Conybeare found a copy of The Key of Truth in a manuscript written in 1782, in the Library of Ejmiacin. He claimed that this was a servicebook of the medieval Paulicians, and it contains a rite of adult baptism with water ."