Modern Hagiography
Lives of the Saints by Alban Butler.
Lives of the Saints by Sabine Baring-Gould.
The Liturgical Year by Dom Guéranger.
The Lives of Saints, with Other Feasts of the Year, According to the Roman Calendar by Peter Ribadeneira.
Medieval Hagiography
The Cult of Saints in Late Antiquity Database – Saint Gordianus & Saint Epimachus
The Golden Legend (and illustrations)
Art & Architecture
Index of Medieval Art – Saint Gordianus & Saint Epimachus
Warburg Institute Iconographic Database
Medieval Religion Listserv – 2016 Dillon.
Catacomba dei Santi Gordiano ed Epimaco
The Saints in Art by Joseph Maria von Radowitz.
Music
Nihil sub sole novum 