List of sources:
Journal of the South African Ornithologists' Union, 1909, Vol. 5(3), Roll of members; 1914, Vol. 10(1), paper by Ingle.
National Archives Repository (TAB), Source MHG, Vol. 0, Ref. 8914/59: Death notice and antenuptual contract, John Clifton Ingle.
National Automated Archival Information Retrieval System (NAAIRS), at http://www.national.archives.gov.za/naairs.htm Documents relating to John Clifton Ingle / J.C. Ingle / Ingle and Banger.
South African Journal of Natural History, 1918, Vol. 1(1), pp. 8-15: Roll of Foundation Members [of the SA Biological Society]; 1920, Vol. 2(2), Roll of members.
Standard Encyclopaedia of Southern Africa (SESA). Cape Town: NASOU, 1970-1976.