(Atiya, Aziz Suryal, ed., 8 vols., New York: Macmillan, 1991). It is undoubtedly the most important reference tool for Coptic studies. The encyclopedia comprises approximately 2,800 entries signed by 215 scholars. They cover almost all aspects of Christianity in Egypt and as such represent an essential reference tool for anyone interested in Egypt’s Christian history, art and archaeology, Coptic language and literature, monasticism, and the Christian Arabic literature of the Copts. It is also a valuable reference tool for many other disciplines, such as Egyptology, papyrology, religious studies, art history, and Islamic studies.