^Fasti Wyndesorienses, May 1950. S.L. Ollard. Published by the Dean and Canons of St George's Chapel, Windsor Castle.
^Fryde, et al. Handbook of British Chronology p. 262
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.