↑ H. Bulzacchelli, Richard (2006). Judged by the Law of Freedom: A History of the Faith-works Controversy, and a Resolution in the Thought of St. Thomas Aquinas. University Press of America. tr. 19. ISBN9780761835011. The Ethiopian and Coptic Churches distinguishes between clean and unclean meats, observes days of ritual purification, and keeps a kind of dual Sabbath on both Saturday and Sunday.
↑ Mary Cecil, 2nd Baroness Amherst of Hackney (1906). A Sketch of Egyptian History from the Earliest Times to the Present Day (bằng tiếng Anh). Methuen. tr. 399. Prayers 7 times a day are enjoined, and the most strict among the Copts recite one of more of the Psalms of David each time they pray. They always wash their hands and faces before devotions, and turn to the East.
↑ Dawood, Bishoy (8 tháng 12 năm 2013). “Stand, Bow, Prostrate: The Prayerful Body of Coptic Christianity” (bằng tiếng Anh). The Clarion Review. Truy cập ngày 6 tháng 8 năm 2020. Standing facing the East is the most frequent prayer position. ... This is further emphasized in the fact that Copts pray facing the East, waiting for the return of Jesus in glory; his return as the enthroned Pantocrator is portrayed in the iconography that is placed before the worshippers.
