List of sources:
Barberton Scientific and Literary Society. Proceedings, July 1888 - October 1889. (Africana Library, Johannesburg).
British Association for the Advancement of Science. Report of the seventy-fifth meeting... South Africa, 1905, list of members.
Debus, A.G. (ed.) World who's who in science. Chicago: Marquis, 1968.
Hall, A.L. A bibliography of South African geology to the end of 1920. Pretoria: Geological Survey, Memoir No. 18, 1922.
National Union Catalogue, pre-1956 imprints. London: Mansell, 1968-1980.
Plug, C. Early scientific and professional societies in the Transvaal: Barberton 1887-1889. South African Journal of Cultural History, 1990, Vol. 4(3), pp. 190-199.
Price, R.R.M. Catalogue of publications of the Geological Survey and government publications dealing with earth sciences. Pretoria: Council for Geoscience, 1997.
Royal Society of London. Catalogue of scientific papers [1800-1900]. London: Royal Society, 1867-1925.
Who was who, Vol. 3, 2nd ed. London: Adam & Black, 1967