List of sources:
Charles ("Charlie") Presswell Tompkins. Ancestry. Retrieved on 5 Februaryu 2021 fromhttps://www.ancestry.ca/genealogy/records/charles-charlie-presswell-tompkins-24-fk2g51
Journal of the Institute of Land Surveyors of the Transvaal, 1906-1910, Vol. 1(6) - 2(1).
National Archives Repository (TAB), Source MHG, Vol. 0, Ref. 2039/51: death notice, Charles Presswell Tompkins.
South African who's who, 1908.
University of the Cape of Good Hope. Calendar, 1907/8.