28 July – Saint Victor I

Modern Hagiography

Roman Martyrology

Sanctorale Catholicum

Lives of the Saints by Alban Butler.

Lives of the Saints by Sabine Baring-Gould.

The Liturgical Year by Dom Guéranger.

Character Calendar

Pictorial Half Hours with the Saints by Auguste François Lecanu.

Medieval Hagiography

BHL 

Liber pontificalis 

Writings of Pope Victor I

Documenta Catholica Omnia