List of sources:
Britten, J. Some early Cape botanists and collectors. Journal of the Linnean Society (Botany), 1920-1922, Vol. 45, pp. 29-51.
Dictionary of South African biography, Vol. 2, 1972.
Fisher, R. Land surveyors and land tenure at the Cape, 1657-1812. In C.G.C. Martin & K.J. Friedlaender (eds), History of surveying and land tenure in South Africa (Vol. 1, pp. 55-88). Cape Town: University of Cape Town, Department of Surveying, 1984.
Godee Molsbergen, E.C. Reizen in Zuid-Afrika in de Hollandsche Tijd (Vol. 3, p. 201n). Den Haag: Linschoten Vereniging, 4 vols, 1916-1932.
Gunn, M. & Codd, L.E. Botanical exploration of southern Africa. Cape Town: Balkema, 1981.
Hoge, J. Personalia of the Germans at the Cape, 1652-1806. Archive Year Book for South African History, 1946.
Karsten, M.C. The old Company s garden at the Cape and its superintendents. Cape Town: Maskew Miller, 1951.
MacOwan, P. Personalia of botanical collectors at the Cape. Transactions of the South African Philosophical Society, 1886, Vol. 4, pp. xxx-liii.
Moritz, E. Die Deutschen am Kap unter den Hollaendischen Herrschaft, 1652-1806 (p. 48). Weimar: H. Boehlaus, 1938.
Mossop, E.E. Journals of the expeditions of the honourable Ensign Olof Bergh (1682 and 1683) and the Ensign Isaq Schrijver (1689).... Cape Town: Van Riebeeck Society, VRS 12, 1931.
Pappe, L. The old Cape Botanic Garden [letter to the Editor]. South African Commercial Advertiser, 23 April 1845, p. 2.
Reynolds, G.W. The aloes of South Africa. Cape Town: Balkema, 1969.
Theal, G.M. History of South Africa under the administration of the Dutch East India Company (Vol. 1, pp. 248-250). London: Swan Sonnenschein, 1897.
Valentyn, F. Beschrijvinge van de Kaap der Goede Hoope met de zaaken daar toe behoorende/ Description of the Cape of Good Hope with the matters concerning it (1726). Cape Town: Van Riebeeck Society, 1971.