Tadros, Y. Malaty (1993). "Introduction to the Coptic Church"(PDF). www.copticchurch.net. p. 71. Archived(PDF) from the original on 22 June 2006. Retrieved 7 December 2018.
One or more of the preceding sentences incorporates text from this source, which is in the public domain: Chapman, John. "Eutyches"The Catholic Encyclopedia Vol. 5. New York: Robert Appleton Company, 1909. 6 February 2019
Tadros, Y. Malaty (1993). "Introduction to the Coptic Church"(PDF). www.copticchurch.net. p. 71. Archived(PDF) from the original on 22 June 2006. Retrieved 7 December 2018.