List of sources:
Cape of Good Hope. Report of the Surveyor-General, 1880.
General directory and guide book to the Cape of Good Hope and its dependencies, 1877, p. 135: Meteorological Commission.
General Directory of South Africa..., 1903, 1908.
Geological Society of South Africa. Transactions, 1906, Vol. 10, pp. xi-xviii: list of members.
Gess, S.K. The history of the Greathead family. Annals of the Grahamstown Historical Society, 1982, Vol. 3, pp. 49-56.
Heese, J.A. South African genealogies. Pretoria and Stellenbosch, 1986-2005.
History of meteorology in South Africa. Weather Bureau Newsletter, centenary edition, 1960, No. 139, pp. 1-48 (whole number).
Journal of the Institute of Land Surveyors of the Transvaal, 1905, Vol. 1(1), pp. 24-27; 1909, Vol. 1(8), pp. 338-341: Lists of members of the institute.
National Archives Repository (TAB), Source MHG, Vol. 0, Ref. 63713: death notice, Walter Horatio Greathead.
Ritchie, W. The history of the South African College, 1829-1918 (Vol. 2, list of alumni). Cape Town: T. Maskew Miller, 1918.
South African Association for the Advancement of Science. Report, 1904: Greathead's paper; 1905/6, 1910: lists of members.
South African who's who, 1917/18.
Transvaal Civil Service List, 1906, p. 147: List of admitted land surveyors.
University of the Cape of Good Hope. Calendar, 1884/5.