List of sources:
Annals of the Transvaal Museum, 1908-1909, Vol. 1: Papers by Howard.
Bottomley, A.M. The development of South African mycology and of the Mycological Herbarium at Pretoria. South African Journal of Science, 1929, Vol. 26, pp. 326-331.
Cape of Good Hope. Report of the trustees of the South African Museum, 1908, 1909.
Doidge, E.M. South African fungi and lichens to the end of 1945. Bothalia, 1950, Vol. 5, pp. 1-1094 (see p. 39).
FamilySearch: Charles Walter Howard. https://ancestors.familysearch.org/en/LXSQ-S1G/charles-walter-howard-1882-1928
Google scholar. http://scholar.google.co.za Publications by C.W. Howard.
[Haagner, A. et al]. The Transvaal Biological Society. South African Journal of Natural History, 1918, Vol. 1(1), pp. 24-32.
Janse, A.J.T. A short history of the South African Biological Society. South African Biological Society Pamphlet, 1939, No. 10, pp. 49-58.
Journal of the South African Ornithologists' Union, 1909, Vol. 5(3): Roll of members.
Lounsbury, C.P. The pioneer period of economic entomology in South Africa. Journal of the Entomological Society of Southern Africa, 1940, Vol. 3, pp. 9-29.
National Automated Archival Information Retrieval System (NAAIRS). http://www.national.archives.gov.za/naairs.htm Documents relating to Howard, C.W.
National Union Catalogue, pre-1956 imprints. London: Mansell, 1968-1980.
Obituary: Charles
Walter Howard. Journal of Economic
Entomology, 1928, Vol. 21, pp. 440-441.
Royal Society of South Africa. Transactions, 1908-1910, Vol. 1: Lists of fellows and members.
South African Association for the Advancement of Science. Report, 1905/6, 1910, 1913: Lists of members and office bearers.
South African Philosophical Society. Transactions, 1907, Vol. 17: List of members.
Transvaal Agricultural Journal, 1906-1908, Vol. 4-6: Articles by Howard.
Transvaal [Colony]. Civil service list, 1906.
Transvaal [Colony], Department of Agriculture. Report, 1907/8.
Transvaal Museum. Annual Report, 1906/7 (National Archives, Pretoria, Vol. TKP 196).