Yovhannes Drasxanakertc'i's History of Armenia, Armenian Historical Sources, Armenian, Byzantine, Caucasian, Iranian, Bagratid History, 9-10th Century Medieval Historian, John Kat'oghikos, Drasxanakertc'i, Introduction. p. 1.

John Kat'oghikos' History of Armenia, p. 1. translated by Krikor Vardapet Maksoudian