List of sources:
Bullock, A. A. Bibliography of South African botany (up to 1951). Department of Agricultural Technical Services, 1978.
Forbes, Helena Madelain Lamond (1900-1959). Retrieved on 9 September 2021 from https://plants.jstor.org/stable/10.5555/al.ap.person.bm000002648
Gunn, M. and Codd, L.E. Botanical exploration of southern Africa. Cape Town: Balkema, 1981.
Helena Madeleine Lamont Forbes. Geni. Retrieved on 10 September 2021 from https://www.geni.com/people/Helena-Madeleine-Lamont-Forbes/6000000071633763374
National Automated Archival Information
Retrieval System (NAAIRS). http://national.archives.gov.za/naairs.htm Documents relating to Helena Madeleine Lamont Forbes.
Obituary: Miss Helena M. L. Forbes. South African Journal of Science, 1959, Vol. 55, p. 317.
Phillips, E. P. Memories of South African botanists. South African Journal of Science, 1965, Vol. 61, pp. 291-296.
Schrire, B. D. Centenary of the Natal Herbarium, Durban, 1882-1982. Bothalia, 1983, Vol. 14 (2), pp. 223-236.