FRASSETTO, Michael. Encyclopedia of Barbarian Europe: Society in Transformation. [s.l.]: ABC-CLIO 419s. Dostupné online. ISBN978-1-57607-263-9. S.163. (anglicky)
RICHE, Pierre. The Carolingians: A Family Who Forged Europe. [s.l.]: University of Pennsylvania Press Dostupné online. ISBN978-0-8122-1342-3. S.86. (anglicky)
THORPE, Lewis. Einhard and Notker The Stammerer: Two Lives of Charlemagne. [s.l.]: Penguin Books Dostupné online. S.216. (anglicky)
DRESVINA, Juliana; SPARKS, Nicholas. Authority and Gender in Medieval and Renaissance Chronicles. [s.l.]: Cambridge Scholars Publishing 495s. Dostupné online. ISBN978-1-4438-4428-4. S.13.
STORY, Joanna. Charlemagne: Empire and Society. [s.l.]: Manchester University Press 330s. Dostupné online. ISBN978-0-7190-7089-1. S.128. (anglicky)
INNES, Matthew. Queenship in Dispute: Fastrada, History and Law. Writing the Early Medieval West. S. 230–247. Dostupné online [cit. 2022-02-03]. doi:10.1017/9781108182386.016. (anglicky)
INNES, Matthew. Queenship in Dispute: Fastrada, History and Law. Writing the Early Medieval West. S. 230–247. Dostupné online [cit. 2022-02-03]. doi:10.1017/9781108182386.016. (anglicky)