List of sources:
Family: Stephen Chapman Townsend / Mary Elizabeth Wooldridge. Retrieved on 17 February 2021 from https://geneagraphie.com/familychart.php?familyID=F303947&tree=1
National Automated Archival Information Retrieval System (NAAIRS). http://national.archives.gov.za/naairs.htm Documents relating to Townsend, Stephen Frank / Townsend, S.F.
Rhodesia Scientific Association. Proceedings, 1904, Vol. 4, paper by Townsend; 1906, Vol. 6(1) and 1918, Vol. 16(2), lists of members.
South African who's who, 1908, 1917/8.
South African Association for the Advancement of Science. Report, 1903, 1905/6, 1910, 1918: Lists of members.
South African Ornithologists' Union. Journal, 1909, Vol. 5(3), roll of members.
Stephen Frank Townsend. eGGSA library. Retrieved on 17 February 2021 from https://www.graves-at-eggsa.org/main.php?g2_itemId=1294248
Wills, W.H. The Anglo-African who's who and biographical sketch book. London: Upcott, 1910.