List of sources:
African court calendar and directory/South African almanac and directory, 1819-1829. Reprinted by SA Library, Cape Town, 1982.
Beck, J.H.M. History of medicine and medical practice at the Cape (1894). In British Medical Association, Cape of Good Hope (Western Province) Branch, Presidential addresses for the years 1888-1908 (pp. 63-111). Cape Town: Taylor & Snashall, 1908.
Blumberg, C. The South African Medical Society, 1827-1846. South African Medical Journal, 17 August 1985, Vol. 68(4), pp. 267-269.
Burrows, E.H. A history of medicine in South Africa up to the end of the nineteenth century. Cape Town: Balkema, 1958.
Dr Johannes Knockers van Oosterzee. British 1820 Settlers to South Africa. Retrieved on 18 March 2021 from https://www.1820settlers.com/genealogy/getperson.php?personID=I9717&tree=master
Heese, J.A. South African genealogies. Pretoria and Stellenbosch, 1986-2005.
Laidler, P.W. & Gelfand, M. South Africa: Its medical history, 1652-1898. Cape Town: Struik, 1971.
National Automated Archival Information Retrieval System (NAAIRS). http://national.archives.gov.za/naairs.htm Documents relating to Van Oosterzee, Johannes Knocker(s) / Dr Van Oosterzee.
South African bibliography to the year 1925, Vol. 5. Cape Town: SA Library, 1991.