Modern Hagiography
Lives of the Saints by Alban Butler.
Lives of the Saints by Sabine Baring-Gould.
The Liturgical Year by Dom Guéranger.
Medieval Hagiography
History of the Tranlsation of the Blessed Martyrs of Christ Marcellinus and Peter
The Golden Legend (and illustrations)
Art & Architecture
The Catacombs of Saints Marcellinus and Peter – official website, see also, and a painting with Saints Marcellinus and Peter
Saints Marcellinus und Petrus in Seligenstadt
Warburg Institute Iconographic Database
Sacred and Legendary Art volume II by Mrs. Jameson.
A Handbook of Christian Symbols and Stories of the Saints as Illustrated in Art by Clara Erskine Clement.
The Saints in Art with Their Attributes and Symbols, Alphabetically Arranged by Margaret E. Tabor.
Saints and their Symbols: A Companion in the Churches and Picture Galleries of Europe by E. A. Greene.
The Saints in Art by Joseph Maria von Radowitz.
Music
Nihil sub sole novum 