List of sources:
Cape of Good Hope. Civil service list, 1896, 1909, 1910.
FamilySearch: Callcott Maximillian Stevens. https://www.familysearch.org/en/tree/person/details/L138-QRM AND https://www.familysearch.org/ark:/61903/1:1:QLKL-6GZ6?lang=en
Gill, D. A history and description of the Royal Observatory, Cape of Good Hope. London: HMSO, 1913.
Koorts, W.P. The 1882 transit of Venus: Observations from Wellington. Phobos: Journal of the West Yorkshire Astronomical Society, 2000, Vol. 27(3), pp. 3- . Retrieved on 29July 2003 via https://webspace.science.uu.nl/~gent0113/venus/venus_text19.htm
National Automated Archival Information Retrieval System (NAAIRS). http://national.archives.gov.za/naairs.htm Documents relating to Stevens, Callcott (also Calcott) Maximilian / Stevens, C.M.
Ritchie, W. The history of the South African College, 1829-1918 (Vol. 2, List of alumni). Cape Town: T. Maskew Miller, 1918.
South African Philosophical Society. Transactions, 1877-1878, Vol. 1, and membership lists in Vols 2 (1881) and 3 (1883).
South African who's who, 1908, 1909.
Wood, H.E. Astronomical relics at Touws River, C.P. South African Journal of Science, 1937, Vol. 33, pp. 127-129.