List of sources:
Britten, J. Some early Cape botanists and collectors. Journal of the Linnaean Society (Botany), 1920-1922, Vol. 45, pp. 29-51.
Gunn, M. & Codd, L.E. Botanical exploration of southern Africa. Cape Town: Balkema, 1981.
Lenta, M. & Le Cordeur, B. (eds). The Cape diaries of Lady Anne Barnard, 1799-1800. Cape Town: Van Riebeeck Society, second series No. 29, 1999.
Oxford dictionary of national biography (William Roxburgh). Oxford University Press, 2004.
Philip, P. British residents at the Cape, 1795-1819. Cape Town: David Philip, 1981.
Roxburgh, John. JSTOR Global Plants. Retrieved from https://plants.jstor.org/stable/history/10.5555/al.ap.person.bm000035265 on 22 June 2020.