The Ante - Nicene Fathers, Volume I, pages 46 - 7; Cyclopedia of Biblical, Theological, and Ecclesiastical Literature, by John McClintock and James Strong, reprinted by Baker Book House Co., 1981, Volume IV, pages 490 - 3; The Catholic Encyclopedia, 1910, Volume VII, pages 644 - 7.
The Ante - Nicene Fathers, I köide, leheküljed 46 — 47; Cyclopedia of Biblical, Theological, and Ecclesiastical Literature, autorid John McClintock ja James Strong, kordustrükk Baker Book House Co., 1981, IV köide, leheküljed 490 — 493; The Catholic Encyclopedia, 1910, VII köide, leheküljed 644 — 647.