List of sources:
FamilySearch: Eric Sydney Earle Cogan. https://www.familysearch.org/ark:/61903/1:1:FWTC-9ZG
Google scholar. http://scholar.google.co.za/ , publications by E.S. Cogan.
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 Union Catalogue, pre-1956 imprints. London: Mansell, 1968-1980.
South African Association for the Advancement of Science. Report, 1917, papers by Cogan; 1918, list of members.
South African Journal of Natural History, 1918, Vol. 1(1), pp. 8-15: Roll of Foundation Members [of the SA Biological Society]; 1919, Vol. 1(2) and 1920, Vol. 2(2): Roll of members.
Thom, H.B. et al. Stellenbosch 1866-1966: Honderd jaar hoër onderwys. Kaapstad: Nasionale Boekhandel, 1966.
University of the Cape of Good Hope. Calendar, 1910/1, 1913/4.