Modern Hagiography
Lives of the Saints by Alban Butler.
Lives of the Saints by Sabine Baring-Gould.
Medieval Hagiography
Art & Architecture
The Chapel of Saints Processus and Martinianus in San Pietro in Vaticano
17C Martyrdom of Saints Processus and Martinianus
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.