List of sources:
Agricultural Journal of the Cape of Good Hope, 1888, Vol. 1, paper by Schen(c)k.
Cape of Good Hope. Civil service list, 1888.
Cape of Good Hope. Report on the cultivation of tobacco in the Colony: Report by the Tobacco Expert for 1886-1887. Parliamentary Report G3-1887.
FamilySearch: Karl Frederick Ludwig Schenk. https://www.familysearch.org/en/tree/person/details/GN9C-ZG8 AND https://www.familysearch.org/ark:/61903/3:1:3Q9M-C91Q-N9N8-W?view=index&personArk=/ark:/61903/1:1:QPWT-FMWV&action=view&cc=2517051&lang=en&groupId=
Malherbe, D.F. du T. Family register of the South African nation. Stellenbosch: Tegniek, 1966.
National Automated Archival Information Retrieval System (NAAIRS). http://national.archives.gov.za/naairs.htm Documents relating to Schenck, Karl Friedrich Ludwig / Schenk, Karl Friedrich Ludwig / Schenck, K.
South African bibliography to the year 1925. London: Mansell, 1979.
South African who's who, 1909, 1917/8, 1919/20, 1923/4, 1927/8.
Standard encyclopaedia of southern Africa (SESA). Cape Town: NASOU, 1970-1976.