^ abFryde, et al. Handbook of British Chronology p. 255
References
Fryde, E. B.; Greenway, D. E.; Porter, S.; Roy, I. (1996). Handbook of British Chronology (Third revised ed.). Cambridge, UK: Cambridge University Press. ISBN0-521-56350-X.
Greenway, Diana E. (1977). "Bishops of Lincoln". Fasti Ecclesiae Anglicanae 1066–1300. Vol. 3: Lincoln. Institute of Historical Research. Archived from the original on 9 August 2011. Retrieved 28 October 2007.
Greenway, Diana E. (1977). "Chancellors". Fasti Ecclesiae Anglicanae 1066–1300. Vol. 3: Lincoln. Institute of Historical Research. Retrieved 28 October 2007.