Barber, Richard (1993): . New York: Barnes & Noble. ISBN 1-56619-363-X. Barlow, Frank (1979): . New York: Longman. ISBN 0-582-50236-5. Barlow, Frank (1986): Thomas Becket. Berkeley: University of California Press. ISBN 0-520-07175-1. Barlow, Frank (2004): «Pont l'Évêque, Roger de (c.1115–1181)». Oxford Dictionary of National Biography. Oxford University Press. Greenway, Diana E. (1999): : Volume 6: York: List 1: Archbishops. Institute of Historical Research. Greenway, Diana E. (1971): F: volume 2: Monastic cathedrals (northern and southern provinces): Archdeacons: Canterbury. Institute of Historical Research. Duggan, Charles (1965): «From the Conquest to the Death of John». i Lawrence, C. H.: (Opptrykk 1999). Stroud: Sutton Publishing. ss. 63–116. ISBN 0-7509-1947-7. Fryde, E. B.; Greenway, D. E.; Porter, S.; Roy, I. (1996): (3. reviderte utg.). Cambridge: Cambridge University Press. ISBN 0-521-56350-X. Knowles, David (1976): (andre utg., opptrykk). Cambridge, UK: Cambridge University Press. ISBN 0-521-05479-6. Powell, J. Enoch; Wallis, Keith (1968): London: Weidenfeld and Nicolson. Stein, Peter (2004): «Vacarius (c.1120–c.1200)». Oxford Dictionary of National Biography. Oxford University Press. Warren, W. L. (1973): . Berkeley: University of California Press. ISBN 0-520-03494-5.