^Fryde, et al. Handbook of British Chronology p. 221
^Thacker, Alan "Deusdedit (d. 664) Oxford Dictionary of National Biography
References
Fryde, E. B.; Greenway, D. E.; Porter, S.; Roy, I. (1996). Handbook of British Chronology (Third revised ed.). Cambridge: Cambridge University Press. ISBN0-521-56350-X.