Michael Angold; Frances Margaret Young; K. Scott Bowie; Margaret Mary Mitchell; Augustine Casiday; Frederick W. Norris; Thomas F. X. Noble; Stewart J. Brown; Julia M. H. Smith; Miri Rubin; Roberta A. Baranowski; R. Po-chia Hsia; Timothy Tackett; Sheridan Gilley; Walter Simons; Hugh McLeod; Brian Stanley (2006). The Cambridge History of Christianity: Volume 5, Eastern Christianity. Cambridge University Press. p. 31. ISBN978-0-521-81113-2.