List of sources:
Ancestry. Robert Watson. Retrieved on 19 April 2021 from https://www.ancestry.com.au/genealogy/records/robert-watson-24-hzjqyf
Cape of Good Hope. Report of the trustees of the South African Museum, 1908.
Cape of Good Hope. Reports on the public health..., 1899.
British Association for the Advancement of Science. Report of the seventy-fifth meeting... South Africa, 1905, list of members.
FamilySearch: Robert Walker Watson. https://www.familysearch.org/ark:/61903/3:1:3Q9M-CSQF-W391-7?view=index&personArk=/ark:/61903/1:1:QGTN-9NJ7&action=view&cc=2517051&lang=en&groupId=M9DB-6RL
Medical and pharmacy register for the Colony of the Cape of Good Hope, 1893, 1907.
National Automated Archival Information Retrieval System (NAAIRS). http://national.archives.gov.za/naairs.htm Documents relating to Watson, Robert Walker / Watson, R.W.
South African medical directory for 1897. Cape Town: Cape Times, 1897.