List of sources:
Natal almanac, directory and yearly register, 1898.
National Union Catalogue, pre-1956 imprints. London: Mansell, 1968-1980.
Robert John Shaw Simpson. Retrieved from https://www.angloboerwar.com/images/pdf/RAMCOfficers1883.pdf on 19 October 2020.
South African medical directory for 1897. Cape Town: Cape Times, 1897.
South African Medical Journal (Series 2), 1898, Vol. 5, pp. 240-242: South African Medical Association [list of members].
Venter, R.J. Bibliography of regional meteorological literature. Vol. 1. Southern Africa, 1486-1948. Pretoria: Weather Bureau, 1949.
Who was who, Vol. 3, 2nd ed. London: Adam & Black, 1967.