List of sources:
Author and Subject Index to the Government Veterinary Reports of the Transvaal and Union of South Africa (1903-1932). Pretoria: Department of Agriculture, June 1937.
Author and Subject Index to the Onderstepoort Journal of Veterinary Science and Animal Industry (1933-1950) and the Onderstepoort Journal of Veterinary Research (1951-1968). Pretoria: Department of Agriculture, June 1969.
Bekker, P.M. Doodsberig: Dr H. Graf. Journal of the South African Veterinary Medical Association, 1960, Vol. 31(3), pp. 423-424.
FamilySearch: Hermann Graf. https://ancestors.familysearch.org/en/G8SM-98Y/prof-hermann-graf-1898-1960 as on 12 August 2024.
Hofmeyr, C.F.B. In memoriam, Prof Dr H. Graf... Suid-Afrikaanse Akademie vir Wetenskap en Kuns, Jaarboek, 1961, p. 7.
National Automated Archival Information Retrieval System (NAAIRS). http://www.national.archives.gov.za/naairs.htm Documents relating to Hermann Graf / H. Graf.
Posthumus, P.J. Past Veterinarians in South Africa, Vol. 1, 10th edition, [1992].
South African Journal of Science, 1926, Vol. 23, paper by Graf.