Tolong jelaskan mengenai Catatan dari Duke dalam bahasa melayu

Chan, Wing-tsit, Chu Hsi New Studies. University of Hawaii Press: 1989. ISBN 978-0-8248-1201-0

Crouch, David, The Normans (2002) ISBN 1-85285-387-5

Hodgkin, Thomas. Italy and her Invaders. Clarendon Press: 1895.

Lewis, Archibald R. "The Dukes in the Regnum Francorum, A.D. 550-751." Speculum, Vol. 51, No 3 (July 1976), pp 381–410.

Stenton, Sir Frank M. Anglo-Saxon England Third Edition. Oxford University Press: 1971.

Thompson, E. A. The Goths in Spain. Clarendon Press: Oxford, 1969.