Hippolytus (Antipope)؛ Origen (1921). Philosophumena (Digitized 9 May 2006). Translation by Francis Legge, F.S.A. Original from Harvard University.: Society for promoting Christian knowledge. ج. 1. مؤرشف من الأصل في 2020-01-25. اطلع عليه بتاريخ 2009-05-22.
Hippolytus (Antipope)؛ Origen (1921). Philosophumena (Digitized 9 May 2006). Translation by Francis Legge, F.S.A. Original from Harvard University.: Society for promoting Christian knowledge. ج. 1. مؤرشف من الأصل في 2020-01-25. اطلع عليه بتاريخ 2009-05-22.