An invaluable reference tool for Coptic Studies is The Coptic Encyclopedia (Aziz S. Atiya, ed. NY: Macmillan, 1991). This monumental work, with approximately 2800 entries written by 215 scholars, covers treasures of Coptic language and literature; Copto-Arabic literature; Coptic art, architecture, archaeology, history, music, liturgy, theology, spirituality, monasticism; and biblical, apocryphal, social, and legal texts.
In 2009 the Claremont Graduate University (CGU) School of Religion acquired the right to develop an updated and continuously expanding and evolving web-based version of The Coptic Encyclopedia. Since then, the Claremont Coptic Encyclopedia (CCE) has been gradually posting the articles of the 1991 Coptic Encyclopedia and will be continuously adding updates and new topics from the growing body of scholarship in Coptic studies at worldwide institutions.
Access the Claremont Coptic Encyclopedia at http://ccdl.libraries.claremont.edu/cdm/landingpage/collection/cce