List of sources:
British Association for the Advancement of Science. Report of the seventy-fifth meeting... South Africa, 1905. London: John Murray, 1906.
Cape of Good Hope. Report of the Surveyor-General, 1879, 1880, 1903.
FamilySearch: Henry Charles Schunke Hollway. https://www.familysearch.org/ark:/61903/3:1:33S7-95F4-B9D?view=index&personArk=/ark:/61903/1:1:QPTJ-GV9C&action=view&cc=1779109&lang=en&groupId=M96D-FM3 AND Carl Heinrich Schunke, https://ancestors.familysearch.org/en/M57P-T87/carl-heinrich-schunkë-1853-1921
Flint, W. & Gilchrist, J.D.F. Science in South Africa (chapter 1, by Schunke). Cape Town: T. Maskew Miller, 1905.
Liebman, J.A. Mashonaland and Matabeleland - facts and figures. A reply to Mr Schunke. Transactions of the South African Philosophical Society, 1891, Vol. 8 (1), pp. 16-22.
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 Schunke, H.C.
Personal communication from Dr Thomas Wagner, Germany (researcher of the Schunke family), August 2015.
Royal Society of London. Catalogue of scientific papers [1800-1900]. London: Royal Society, 1867-1925.
Royal Society of South Africa. Transactions, 1908-1910, Vol. 1 and 1917, Vol. 6: Lists of Fellows and members.
South African bibliography to the year 1925, Vol. 5. Cape Town: South African Library, 1991.
South African Philosophical Society. Transactions, 1879-1907, Vol. 2-4, 6-10, 16, 17: lists of members and papers by Schunke.
University of the Cape of Good Hope. Calendar, 1884/5.