Sekundærlitteratur Abels, Richard (2005): . Longman. ISBN 0-582-04047-7. Ashley, Mike (1998): . London: Robinson. ISBN 1-84119-096-9. Campbell, James; John, Eric; Wormald, Patrick (1991): . London: Penguin Books. ISBN 0-14-014395-5. Edwards, Heather (2004): «Ecberht» i: Fletcher, Richard (1989): . Shepheard-Walwyn. ISBN 0-85683-089-5. Higham, N.J.; Hill, D.H. (2001): . Routledge. ISBN 9780415214971. Hunter Blair, Peter (1966): . W.W. Norton & Company. ISBN 0-393-00361-2. Kirby, D.P. (1992): . London: Routledge. ISBN 0-415-09086-5. Naismith, Rory (2011): «The Origins of the Line of Egbert, King of the West Saxons, 802–839» (PDF) i: , Oxford University Press. CXXVI (518): 1–16. doi:10.1093/ehr/ceq377. Nelson, Janet L. (2004): «Æthelwulf (d. 858)» i: . Oxford University Press. doi:10.1093/ref:odnb/8921. Payton, Philip (2004): . Cornwall Editions. ISBN 1-904880-00-2. Stenton, Frank M. (1971): . Oxford: Clarendon Press. ISBN 0-19-821716-1. Whitelock, Dorothy (1968): . London: Eyre & Spottiswoode. Wormald, Patrick; Bullough, D.; Collins, R. (1983): . Oxford. ISBN 0-631-12661-9. Yorke, Barbara (1990): . London: Seaby. ISBN 1-85264-027-8. Yorke, Barbara (1995): . London: Leicester University Press. ISBN 0-7185-1856-X.