List of sources:
Cape of Good Hope Government Gazette, 9 January 1885, pp. 41-45: List of licensed medical practitioners in the Cape Colony.
Medical and Pharmacy Register for the Colony of the Cape of Good Hope, 1893. Cape Town: W.A. Richards & Sons.
National Automated Archival Information Retrieval System (NAAIRS). http://www.national.archives.gov.za/naairs.htm Documents relating to Guild, Robert Keith / Guild, Robert K. / Guild, R.K.
South African bibliography to the year 1925. London: Mansell, 1979.
South African Philosophical Society. Transactions, 1883-1887, Vol. 3, 4: Lists of members.