List of sources:
African Court Calendar, 1801, 1802. (Reprinted by the South African Library).
Barrow, J. An account of travels into the interior of southern Africa, in the years 1797 and 1798; including cursory observations on the geology and geography... London, 2 vols, 1801-1804.
The Cape diaries of Lady Anne Barnard, 1799-1800 (2 vols; ed. by M. Lenta and B. Cordeur). Cape Town: Van Riebeeck Society, Second Series, No. 29 and 30, 1999.
The Cape journals of Lady Anne Barnard, 1797-1798 (ed. by A.M. Lewin Robinson). Cape Town: Van Riebeeck Society, Second Series, No. 24, 1994.
Dictionary of South African biography, Vol. 2, 1972.
Duminy, A. Mapping South Africa; a historical survey of South African maps and charts (second, revised impression). Auckland Park: Jacana, 2013.
Forbes, V.S. The first modern geographer and geologist in South Africa: Sir John Barrow. South African Geographical Journal, 1944, Vol. 26, pp. 44-75.
Forbes, V.S. Pioneer travellers in South Africa: a geographical commentary upon routes, records, observations and opinions of travellers at the Cape, 1750-1800. Cape Town: Balkema, 1965.
Gunn, M. & Codd, L.E. Botanical exploration of southern Africa. Cape Town: Balkema, 1981.
Liebenberg, E. From Barrow to Jeppe - the development of 19th century cartography in South Africa. In E. Liebenberg (ed.), Proceedings of the symposium on the history of cartography of Africa... (pp. 103-119). Pretoria: International Cartographic Association, 2003.
National Union Catalogue, pre-1956 imprints. London: Mansell, 1968-1980.
Norwich, O.I. Maps of Africa. Johannesburg: A.D. Donker, 1983.
Oxford dictionary of national biography. Oxford University Press, 2004.
South African bibliography to the year 1925. London: Mansell, 1979 (Vol. 1-4); Cape Town: South African Library, 1991 (Vol. 5).
South African Commercial Advertiser, 13 May 1848, pp. 2-3, "Botanical garden, Cape Town".
Talbot, W.J. Pathfinders and pioneers, explorers and scientists. In A.C. Brown (ed.), A history of scientific endeavour in South Africa (pp. 1-32). Cape Town: Royal Society of South Africa, 1977.
Theal, G. Records of the Cape Colony (Vol. 4, pp. 85-86, 221-274). London, 1898-1899.
Warner, B. Royal Observatory, Cape of Good Hope, 1820-1831. Dordrecht: Kluwer, 1995.