Simon Carrington(英语:Simon Carrington) – 第二男中音(1968-1993) Gabriel Crouch(英语:Gabriel Crouch) – 第二男中音(1996-2004) Christopher Gabbitas(英语:Christopher Gabbitas)
Normandy and its Neighbours 900–1250; Essays for David Bates, ed. David Crouch, Kathleen Thompson (Brepols Publishers, Belgium, 2011), pp. 69–70 Kathleen
ISBN 978-0-631-19028-8. Crouch, David. The Normans: The History of a Dynasty. London, UK: Hambledon Continuum. 2002. ISBN 978-1-85285-595-6. Crouch, David. The Beaumont