* Enright, M. (1979). "Charles the Bald and Aethelwulf of Wessex: the alliance of 856 and strategies of royal succession". Journal of Medieval History (באנגלית) (Journal of Medieval History ed.). 5 (4): 291–302. doi:10.1016/0304-4181(79)90003-4. ISSN0304-4181.{{cite journal}}: תחזוקה - ציטוט: date and year (link)
Nelson, Janet L. "Judith (b. after 843, d. c. 870)". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/39264. (Subscription or UK public library membership required.)
* Enright, M. (1979). "Charles the Bald and Aethelwulf of Wessex: the alliance of 856 and strategies of royal succession". Journal of Medieval History (באנגלית) (Journal of Medieval History ed.). 5 (4): 291–302. doi:10.1016/0304-4181(79)90003-4. ISSN0304-4181.{{cite journal}}: תחזוקה - ציטוט: date and year (link)