Modern Angelology
Lives of the Saints by Alban Butler.
Lives of the Saints by Sabine Baring-Gould.
The Liturgical Year by Dom Guéranger.
Our Birthday Bouquet Culled from the Shrines of the Saints and the Gardens of the Poets by Eleanor C. Donnelly.
The Lives of Saints, with Other Feasts of the Year, According to the Roman Calendar by Peter Ribadeneira.
Medieval Angelology
About the originating account, Liber de apparitione Sancti Michaelis.
Breviarium Romanum – Latin & English.
Art & Architecture
The sanctuary of Monte Sant’Angelo
A Guide to Christian Iconography: Images, Symbols, and Texts
Nihil sub sole novum 