Introductory Notice to Hippolytus
- From the Ante-Nicene Fathers, vol. 5, American edition. In the first half, reacting in horror to Vatican I, author A. Cleveland Coxe is at pains to say that Hippolytus of Rome was not Roman, had no connection with Rome, and that the city of Rome is someh
- http://www.ccel.org/ccel/schaff/anf05.iii.ii.html

Hippolytus [or: Hippolytus of Rome]
- Short essay on his life and writings. By Anders Ekenberg.
- http://www2.evansville.edu/ecoleweb/glossary/hippolytus.html

Hippolytus, Bishop, Scholar, and Martyr
- Suggests that he was bishop of Ostia rather than Rome, and accepts the tradition that he was martyred.
- http://elvis.rowan.edu/~kilroy/JEK/08/12.html

St. Hippolytus of Rome
- Presbyter, antipope, martyr, died about 236.
- http://www.newadvent.org/cathen/07360c.htm