Vardan Arewelts'i's, Compilation of History: "In these time there lived the glorious princes Zak'are' and Iwane', sons of Sargis, son of Vahram, son of Zak'are', son of Sargis of Kurdish nationality (i K'urd azge')" p. 82
Hugh N. Kennedy, The Prophet and the age of the Caliphates : the Islamic Near East from the sixth to the eleventh century, Harlow, England, Pearson-Longman, , 2nd éd. (ISBN0-582-40525-4, OCLC55792252, lire en ligne)