Modern Hagiography
Lives of the Saints by Alban Butler.
Lives of the Saints by Sabine Baring-Gould.
The Liturgical Year by Dom Guéranger.
Miniature Lives of the Saints for Every Day in the Year
Stories of the Saints Fifth Series by Mary Seymour.
Medieval Hagiography
Breviarium Romanum – Latin & English.
Writings by Saint Peter Damian
St. Peter Damian: Selected Writings on the Spiritual Life
St. Peter Damian – The Lord Be With You | Catholic Culture Audiobooks
Art & Architecture
Catalogo generale dei beni culturali
BeWeB (Pietro Damiani), also (Pier Damiano), & also (Pier Damiani), & also (Pietro Damiano)
Warburg Institute Iconographic Database
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.
Customs & Devotions
Nihil sub sole novum 
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