Gregorius abu-l-Faraj b. Harun (1890). Sahlani, Anton (ed.). Tārīkh mukhtaṣar al-duwal. Beirut: Imprimerie Catholique. Retrieved September 10, 2018.
bethmardutho.org
gedsh.bethmardutho.org
Takahashi 2011, p. 54-56. Takahashi, Hidemi (2011). "Bar ʿEbroyo, Grigorios". Gorgias Encyclopedic Dictionary of the Syriac Heritage. Piscataway, NJ: Gorgias Press. pp. 54–56.
books.google.com
Teule 2012, p. 588-609. Teule, Herman G. B. (2012). "Barhebraeus". Christian-Muslim Relations: A Bibliographical History. Vol. 4. Leiden-Boston: Brill. pp. 588–609. ISBN978-9004228542.
Teule 2012, p. 589. Teule, Herman G. B. (2012). "Barhebraeus". Christian-Muslim Relations: A Bibliographical History. Vol. 4. Leiden-Boston: Brill. pp. 588–609. ISBN978-9004228542.