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Butler, Alban. Lives of the Saints, Edited, revised, and supplemented by Herbert Thurston and Donald Attwater. Palm Publishers, 1956.
Fryde, E. B.; Greenway, D. E.; Porter, S.; Roy, I. (1996). Handbook of British Chronology (edisi ke-Third revised). Cambridge, UK: Cambridge University Press. ISBN0-521-56350-X.