List of sources:
Anderson, J.M. & Anderson, H.M. Palaeoflora of southern Africa. Rotterdam: Balkema, 1985.
Anhaeusser, C.R. (ed.) A century of geological endeavour in southern Africa, 1895-1995 (pp. 15, 126). Johannesburg: Geological Society of South Africa, 1997.
Cape of Good Hope. Report of the Alexander McGregor Memorial Museum, Kimberley, 1908.
Cape of Good Hope. Report of the trustees of the South African Museum, 1907.
Du Toit, A.L. Some reminiscences. Transactions of the Geological Society of South Africa, 1945, Vol. 48, pp. vi-x.
Geological Society of South Africa. Transactions (and Proceedings), 1899, Vol. 4; 1903, Vol. 6; 1906, Vol. 10; 1915, Vol. 18; and 1920, Vol. 23: Papers and lists of members.
Gunn, M. & Codd, L.E. Botanical exploration of southern Africa. Cape Town: Balkema, 1981.
Hall, A.L. A bibliography of South African geology.... Pretoria: Geological Survey, Memoirs No. 18 (1922) and 25 (1927).
Journal of the South African Geographical Society, 1917, Vol. 1(1), list of members.
Kovacs, I. Redan petroglyphs. The Digging Stick, November 1998, Vol. 15(3), pp. 10-11.
National Automated Archival Information Retrieval System (NAAIRS). http://www.national.archives.gov.za/naairs.htm Documents relating to Thomas Nicholas Leslie / T.N. Leslie.
Obituary: Thomas Nicholas Leslie, DSc, FGS, FRMetS. South African Journal of Science, 1943, Vol. 40, pp. xxi-xxii.
Phillips, E.P. A brief historical sketch of the development of botanical science in South Africa... South African Journal of Science, 1930, Vol. 27, pp. 39-80.
Rogers, A.W. The pioneers of South African geology and their work. Transactions of the Geological Society of South Africa, 1937, Annexure to Vol. 39, pp. 1-139.
Royal Society of South Africa. Transactions, 1908-1910, Vol. 1, and 1917, Vol. 6: Lists of Fellows and members.
South African Association for the Advancement of Science. Report, 1904, 1905/6, 1910, 1918: Lists of members.
South African bibliography to the year 1925. London: Mansell, 1979 (Vol. 1-4) and Cape Town: SA Library, 1991 (Vol. 5).
South African Journal of Science, 1924, Vol. 21; and 1926, Vol. 23: Papers by Leslie.
South African Philosophical Society. Transactions, 1906-1907, Vol. 16-17: Lists of members.
Transvaal Agricultural Journal, 1903, Vol. 1-2.
Transvaal Colony, Meteorological Department. Report, 1902/3,1904/5, 1907.
Transvaal [Colony]. Transvaal Observatory: Annual Report of the Meteorological Department for the year ended 30th June 1909. Pretoria: Government Printer, 1910.
University of the Witwatersrand. Honorary Graduates. http://www.wits.ac.za/alumni/alumnirecognition/3600/honorary_degrees.html