List of sources:
Cape of Good Hope. Report of the Surveyor-General, 1880 (list of land surveyors admitted since 1860).
Fleck, John
Christopher. eGGSA Library, at http://www.eggsa.org/library/main.php?g2_itemId=3037797 Retrieved on 16 November 2016.
General directory and guide book to the Cape of Good Hope and its dependencies, 1886, p. 333. Cape Town: Saul Solomon.
Heese, J.A. South African genealogies. Pretoria and Stellenbosch, 1986-2005.
Jeppe, F. Transvaal book almanac and directory for 1877, p. 62. Pretoria: State Library, Reprint No. 80, 1976.
Liebenberg, E.C. Die topografiese kartering van Suid-Afrika, 1879-1972: 'n Histories-geografiese ontleding (p. 138). M.A.-verhandeling in geografie, Universiteit van Suid-Afrika, 1973.
National Automated Archival Information Retrieval System (NAAIRS). http://www.national.archives.gov.za/naairs.htm Documents relating to Fleck, John C. / Fleck, John Christopher / Fleck, J.C. /Fleck, John Cristoffel.