List of sources:
British Association for the Advancement of Science. Report of the seventy-fifth meeting... South Africa 1905, list of members.
FamilySearch: Walter Hubert Cox. https://www.familysearch.org/ark:/61903/1:1:DHJH-F63Z and https://www.familysearch.org/ark:/61903/1:1:QGT6-TWTL
Gill, D. A history and description of the Royal Observatory, Cape of Good Hope (Appendix 1). London: HMSO, 1913.
Google scholar. http://scholar.google.co.za Publications by W.H. Cox.
Journal of the Astronomical Society of South Africa, 1923-1931, Vol. 1(4) - 3(2).
Long, A.W. The foundation and development of the Astronomical Society of South Africa. Journal of the Astronomical Society of South Africa, January 1930, Vol. 2(4), pp. 153-180.
National Automated Archival Information Retrieval System (NAAIRS). http://www.national.archives.gov.za/naairs.htm Documents relating to Cox, Walter Hubert / Cox, W.H.
Obituary. Walter Hubert Cox: 1864-1932. Journal of the Astronomical Society of South Africa, 1932, Vol. 3(2), pp. 85-86.
South African Association for the Advancement of Science. Report, 1903, 1905/6, 1910, 1918: Lists of members.
South African who's who, 1908, 1919/1920.