Tolong jelaskan mengenai Bacaan selanjutnya dari Bretwalda

Charles-Edwards, T. M. "The continuation of Bede, s.a. 750. High-kings, kings of Tara and Bretwaldas." In Seanchas. Studies in early and medieval Irish archaeology, history and literature in honour of Francis J. Byrne, ed. Alfred P. Smyth. Dublin: Four Courts, 2000. 137–45.

Dumville, David "The Terminology of Overkingship in Early Anglo-Saxon England." In The Anglo-Saxons from the Migration period to the Eighth Century. An Ethnographic Perspective, ed. J. Hines (1997): 345–65

Keynes, Simon. "Bretwalda." In The Blackwell Encyclopaedia of Anglo-Saxon England, ed. Michael Lapidge et al. Oxford, 1999.

Kirby, D. P. The Making of Early England. London, 1967.

Wormald, Patrick. "Bede, Beowulf and the conversion of the Anglo-Saxon aristocracy." In Bede and Anglo-Saxon England. Papers in honour of the 1300th anniversary of the birth of Bede, ed. R. T. Farrell. BAR, British series 46. 1978. 32–95.

Yorke, Barbara. "The vocabulary of Anglo-Saxon overlordship." Anglo-Saxon Studies in Archaeology and History 2 (1981): 171–200.