List of sources:
Bullock, A.A. Bibliography of South African botany (up to 1951). Pretoria: Department of Agricultural Technical Services, 1978.
Cape Naturalist, 1934, Vol. 1, No. 1, pp. 25-28, "Club roll".
FamilySearch: Frank Bolus. Retrieved on 19 September 2023 from https://www.familysearch.org/tree/person/details/L6QG-WSX
Gilliland, H.B. On the history of plant study upon the Witwatersrand. Journal of South African Botany, 1953, Vol. 19, pp. 93-104.
Gunn, M. & Codd, L.E. Botanical exploration of southern Africa. Cape Town: Balkema, 1981.
South African Journal of Natural History, 1919, Vol. 1, No. 1, pp. 274-277, Members [of the South African Biological Society].
South African Ornithologists Union. Journal, 1909, Vol. 5, No. 3, Roll of members.
Transvaal Colony, Department of Agriculture. Report, 1903/4.