List of sources:
Cape of Good Hope Government Gazette, 9 January 1885, pp. 41-45: List of licensed medical practitioners in the Cape Colony.
FamilySearch: Robert Keith Guild. https://www.familysearch.org/ark:/61903/1:1:QVLX-CLN5 and https://www.familysearch.org/ark:/61903/1:1:KDCK-VRJ
Medical and Pharmacy Register for the Colony of the Cape of Good Hope, 1893. Cape Town: W.A. Richards & Sons.
South African bibliography to the year 1925. London: Mansell, 1979.
South African Philosophical Society. Transactions, 1883-1887, Vol. 3, 4: Lists of members.