Hippolytus (Antipope); Origen. Philosophumena (Digitized 9 May 2006) 1. Translation by Francis Legge, F.S.A. Original from Harvard University.: Society for promoting Christian knowledge. 1921 [22 May 2009]. (原始内容存档于2021-01-17).
Hippolytus (Antipope); Origen. Philosophumena (Digitized 9 May 2006) 1. Translation by Francis Legge, F.S.A. Original from Harvard University.: Society for promoting Christian knowledge. 1921 [22 May 2009]. (原始内容存档于2021-01-17).