Intelligence Division of British War Office (Ministry of Defence, Great Britain); Center for Ancient Middle Eastern Landscapes, Institute for the Study of Ancient Cultures, University of Chicago
British War Office (2016). Egyptian Sudan: Dongola sheet 45A. British War Office. https://isac-idb.uchicago.edu/id/92fafc92-4e48-4e48-9823-ce2fd772f107 (map)