Lives of the Saints by Alban Butler.
Lives of the Saints by Sabine Baring-Gould.
The Liturgical Year by Dom Guéranger.
Victories of the Martyrs by Saint Alphonsus Liguori.
Miniature Lives of the Saints for Every Day of the Year
The Lives of Saints, with Other Feasts of the Year, According to the Roman Calendar by Peter Ribadeneira.
Ancient & Medieval Hagiography
Breviarium Romanum – Latin & English
Writings of Polycarp
The Epistle of Polycarp to the Philippians
Fragments from Victor of Capua
Art & Architecture
Warburg Institute Iconographic Database
Post-Biblical Saints Art Index
The Saints in Art by Joseph Maria von Radowitz.
Emblems of Saints by Which They Are Distinguished in Works of Art by F. C. Husenbeth.