Schaff, Philip (1998) [1858–1890]. History of the Christian Church. 2: Ante-Nicene Christianity. A.D. 100–325. Christian Classics Ethereal Library. ISBN9781610250412. Consultado el 13 de octubre de 2019. «The ante-Nicene age... is the natural transition from the Apostolic age to the Nicene age....»
Ferguson, Kitty (2011). Pythagoras: His Lives and the Legacy of a Rational Universe. Icon Books Limited. p. 100. ISBN978-1-84831-250-0. «It was in the Near and Middle East and North Africa that the old traditions of teaching and learning continued, and where Christian scholars were carefully preserving ancient texts and knowledge of the ancient Greek language».