List of sources:
Google Scholar. http://scholar.google.co.za Publications by A.J. Attridge.
Henry Attridge. Ancestry. Retrieved on 23 January 2023 from https://www.ancestry.com/genealogy/records/henry-attridge-24-jcp3cx
National Automated Archival Information Retrieval System (NAAIRS), at http://www.national.archives.gov.za/naairs.htm Documents relating to Attridge, Alfred James / Attridge, A.J.
South African bibliography to the year 1925. Vol. 1-4, London: Mansell, 1979; Vol. 5, Cape Town: SA Library, 1991.
Standard Encyclopaedia of Southern Africa (SESA). Cape Town: NASOU, 1970-1976.