List of sources:
Bolus, H. The orchids of the Cape Peninsula. Transactions of the South African Philosophical Society, 1888, Vol. 5(1), pp. 75-200.
Cape of Good Hope almanac and annual register for 1857, directory.
FamilySearch: William W. Dickson. https://www.familysearch.org/ark:/61903/1:1:QGVS-2QR5
General directory and guide book of the Cape of Good Hope..., 1886, pp. 356-357, and directory.
McCracken, D.P. & McCracken, E.M. The way to Kirstenbosch. Cape Town: Annals of the Kirstenbosch Gardens, Vol. 18, 1988.
Ritchie, W. The history of the South African College, 1829-1918. Cape Town: T. Maskew Miller, 1918.