List of sources:
Cape Monthly Magazine, December 1857, Vol. 2(12), pp. 415-419: The Cape of Good Hope Horticultural and Floricultural Society.
Cape of Good Hope. Report of the Committee of Management of the Botanic Garden, Cape Town, 1855-1866, 1868, 1871-1874, 1880.
Cape of Good Hope almanac and annual register (title varies), 1851, 1854, 1857, 1863.
Gunn, M. & Codd, L.E. Botanical exploration of southern Africa. Cape Town: Balkema, 1981.
Mendelssohn, S. South African bibliography. London, 1910.
National Automated Archival Information Retrieval System (NAAIRS). http://www.national.archives.gov.za/naairs.htm Documents relating to McGibbon, James / McGibbon, J.
South African Agricultural Register and Eastern Province Magazine, 2 December 1858, Vol. 1(9), p. 101, Cultivation of the cotton plant at the Cape.
South African bibliography to the year 1925. London: Mansell, 1979 (Vols 1-4); Cape Town: South African Library, 1991 (Vol. 5).
South African Philosophical Society. Transactions, 1877-1879, Vol. 1, list of members.
De Volkstem, 26 December 1874, p. 4, Botanic Garden.