List of sources:
FamilySearch: Frederick William Watson. https://www.familysearch.org/ark:/61903/3:1:3Q9M-C9BY-R3ZB-N?view=index&personArk=/ark:/61903/1:1:WQQM-GYT2&action=view&cc=2998108&lang=en&groupId= AND https://www.familysearch.org/en/tree/person/details/P7LY-3VS
Google Scholar. http://scholar.google.co.za
Journal of the
Chemical, Metallurgical and Mining Society of South Africa, 1904/5, Vol. 5,
List of members; 1910/1, Vol. 11, paper by F.W. Watson; 1911/2, Vol. 12 to
1913/4, Vol. 14, List of officers; 1940, Vol. 41(1), Past presidents.
National Automated Archival Information Retrieval System
(NAAIRS). http://www.national.archives.gov.za/naairs.htm Documents relating to Frederick William
Watson.
South African Association for the Advancement of Science. Report, 1918, List of members.
South African Chemical Institute. Proceedings and list of members, 1921/2 and 1933/4.