List of sources:
Cape Chemical Society. Proceedings, 1906-1912.
Cape of Good Hope. Report of the principal of the agricultural school at Elsenburg, 1903; later "Report of the principal of the college of agriculture at Elsenburg", in the Report of the Director of Agriculture, 1905-1909.
FamilySearch: George Neville Blackshaw and George N. Blackshaw. Retrieved on 4 September 2023 from https://www.familysearch.org/ark:/61903/1:1:XSX4-P4V and https://www.familysearch.org/search/record/results?q.givenName=George Neville&q.surname=Blackshaw
Hall, A.L. A bibliography of South African geology to the end of 1920. Pretoria: Geological Survey, Memoir No. 18, 1922.
South African Association for the Advancement of Science. Report, 1905/6, 1910, 1918: Lists of members; 1913: Officers and council; 1911, 1912: Papers by Blackshaw.
Southern Rhodesia. Report of the Director of Agriculture, 1911-1914, 1925, 1926.
South African Journal of Science, 1920, Vol. 17, paper by Blackshaw; 1937, Vol. 34, pp. xiii-xix: Presidents and secretaries of the sections.
Zimbabwe Scientific Association. Transactions, 1999, Vol. 73, centenary issue: Past Presidents, 1899-1998.