Greenway (1971). Greenway, Diana E., ed. (1971). "Bishops of Carlisle". Fasti Ecclesiae Anglicanae 1066–1300. Vol. 2: Monastic Cathedrals (Northern and Southern Provinces). London: Institute of Historical Research. pp. 19–21. Retrieved 19 October 2013 – via British History Online.
Rickard (2002), p. 168; Usher (1991). Rickard, John (2002). The Castle Community: The Personnel of English and Welsh Castles, 1272–1422. Woodbridge, Suffolk: Boydell Press. ISBN978-0-85115-913-3. Usher, Howard (1991). "Melbourne Castle"(PDF). Derbyshire Miscellany. 12 (5). Stafford: Derbyshire Archaeological Society: 126–132. ISSN0417-0687.
Rickard (2002), p. 168; Usher (1991). Rickard, John (2002). The Castle Community: The Personnel of English and Welsh Castles, 1272–1422. Woodbridge, Suffolk: Boydell Press. ISBN978-0-85115-913-3. Usher, Howard (1991). "Melbourne Castle"(PDF). Derbyshire Miscellany. 12 (5). Stafford: Derbyshire Archaeological Society: 126–132. ISSN0417-0687.