List of sources:
Cape of Good Hope almanac and annual register, 1874-1877.
Curson, H.H. Matters of veterinary interest, 1795-1881. Journal of the South African Veterinary Medical Association, 1935, Vol. 6, pp. 78-107, 196-218, 274-296.
Google scholar. http://scholar.google.co.za Publications by G.L. Bonnar.
Medical, dental and pharmacy directory of South Africa, 1926/7. Pietermaritzburg: Natal Witness, 1926.
My Heritage. www.myheritage.com/names/george_bonnar as on 2015-11-5.
Natal (Colony). Departmental Reports, 1904, Natal medical, dental, pharmacy and veterinary registers, 1904.
Natal almanac, directory and yearly register, 1872-1884, 1890, 1898, 1900.
Natal Government Gazette, 7 September 1880, p. 644: List of voters, Durban.
National Automated Archival Information Retrieval System (NAAIRS). http://www.national.archives.gov.za/naairs.htm Documents relating to Bonnar, George Lindsay.
National Union Catalogue, pre-1956 imprints. London: Mansell, 1979.
South African Medical Directory for 1897. Cape Town: Cape Times, 1897.
South African who's who, 1919/1920.