List of sources:
Cape of Good Hope. Report of the committee of the Albany Museum, 1891.
Cape of Good Hope Government Gazette, 9 January 1885, pp. 41-45: List of licensed medical practitioners in the Cape Colony.
FamilySearch: Jacob Hanau. https://www.familysearch.org/tree/person/details/G6TS-JHL AND https://www.familysearch.org/ark:/61903/1:1:QK1V-2V3H
General directory and guide book to the Cape of Good Hope and its dependencies, 1886, pp. 240-241.
Medical and Pharmacy Register for the Colony of the Cape of Good Hope, 1893, 1907.
National Union Catalogue, pre-1956 imprints. London: Mansell, 1968-1980.
South African Medical Directory for 1897. Cape Town: Cape Times, 1897.
South African Medical Journal, 2nd series, December 1895, Vol. 3, p. 235: CGH Branch of the BMA, list of members.
South African Philosophical Society. Transactions, 1900, Vol. 11, list of members.