List of sources:
Adresses and papers read at the joint meeting of the British and South African Associations for the Advancement of Science, held in South Africa, 1905, Vol. 3: Paper by Sim.
Agricultural Journal of the Cape of Good Hope, 1889, Vol. 2; 1899, Vol. 14; and 1900, Vol. 16: Papers by Sim.
Bayer, A.W. Aspects of Natal's botanical history. South African Journal of Science, 1971, Vol. 67, pp. 401-411.
Bews, J.W. South African naturalists. 3. Dr T.R. Sim. The Cape Naturalist, 1934, Vol. 1(1), pp. 170-172.
Bullock, A.A. Bibliography of South African Botany (up to 1951). Pretoria: Department of Agricultural Technical Services, 1978.
Cape of Good Hope. Civil service list, 1896, 1902.
Cape of Good Hope. Report of the Colonial Botanist, 1897.
Cape of Good Hope. Report of the Committee of the Albany Museum, 1891, 1892, 1899.
Cape of Good Hope. Report of the Conservator of Forests, 1895, 1899.
Cape of Good Hope. Report of the trustees of the South African Museum, 1908.
Cape of Good Hope. Report on the King William's Town Botanic Gardens, 1892, 1893.
Dictionary of South African biography, Vol. 2, 1972.
Gunn, M. & Codd, L.E. Botanical exploration of southern Africa. Cape Town: Balkema, 1981.
Hutchinson, J. A botanist in southern Africa. London: Gawthorn, 1946.
Kaffrarian Watchman, 20 August 1890 and 4 September 1896: King William's Town Naturalists' Society.
Keet, J.D.M. Historical review of the development of forestry in South Africa (c. 1972). Digital copy received from Forestry Scientific/Technical Support, Knysna, January 2011.
Kerkham, A.S. Southern African botanical literature, 1600-1988. Cape Town: South African Library, 1988.
The late Dr T.R. Sim. Journal of the South African Forestry Association, 1938, No. 1, pp. 1-2.
Marwick, C.W. Kwamahlati: The story of forestry in Zululand. Pretoria: Department of Forestry, Bulletin 49, 1973.
Natal [Colony], Agricultural Department. Annual report, 1902, pp. 69-92: Annual report of the Conservator of Forests.
Natal [Colony]. Report of the Conservator of Forests, 1903/4.
Natal Agricultural Journal, 1903-1906, Vol. 6, 7 and 9, articles by Sim.
Natal civil service list, 1906.
Natal who's who, 1906.
Obituary: Dr T.R. Sim. Transactions of the Royal Society of South Africa, 1942, Vol. 29, pp. lv-lvi.
Pole-Evans, I.B. A sketch of the rise, growth and development of mycology in South Africa. South African Journal of Science, 1916, Vol. 13, pp. 97-116.
Sim, T.R. The Bryophyta of South Africa. Transactions of the Royal Society of South Africa, 1926, Vol. 15 (with a further paper in 1932, Vol. 20).
South African Association for the Advancement of Science. Report, 1905/6, 1918: List of members; 1915, 1916, 1917, 1920: Papers by Sim.
South African bibliography to the year 1925. London: Mansell, 1979.
South African Journal of Natural History, 1918, Vol. 1(1), pp. 8-15: Roll of Foundation Members [of the SA Biological Society].
South African Journal of Science, 1923, 1924, 1926, 1931: Papers by Sim.
South African Philosophical Society. Transactions, 1905-1907, Vol. 16: Paper by Sim.
University of the Cape of Good Hope (1873-1918) and University of South Africa (1918-1987). [Register of honorary degrees conferred]. University of South Africa Archives.