2 July – Saint Otto of Bamberg

Modern Hagiography

Roman Martyrology

Sanctorale Catholicum

Lives of the Saints by Alban Butler.

Lives of the Saints by Sabine Baring-Gould.

Lives of the Saints by Francis Weninger.

Stories of the Saints Fifth Series by Mary Seymour.

Medieval Hagiography

BHL, Supplement

The Life of Otto, Apostle of Pomerania by Ebo and Herbordus.

Art & Architecture

The Tomb of Saint Otto in Michaelsburg Abbey in Bamberg

Fresco of Saint Otto in Prüfening Abbey 

Warburg Institute Iconographic Database