Lives of the Saints by Sabine Baring-Gould.
The Life of Saint Adelaide by Odilo of Cluny (in German translation)
Writings by and to Saint Adelaide
Adelaide di Borgogna, an opera by Gioachino Rossini (various excerpts).
Lotario, an opera by Georg Friedrich Handel (full video)
Medieval Religion Listserv – 2015 Dillon.
The Saints in Art by Joseph Maria von Radowitz.