List of sources:
Agricultural Journal (Union of South Africa), 1913, Vol. 6, paper by Harber.
Creagh, O'M. and Humphris, E.M. The Distinguished Service Order, 1886-1923. London: J.B. Hayward, 1978.
FamilySearch: Augustus Frederick Harber. https://ancestors.familysearch.org/en/GJWL-KGH/augustus-frederick-harber-1875-1966 AND https://www.familysearch.org/ark:/61903/3:1:3Q9M-C9BP-WSMF-3?view=index&personArk=/ark:/61903/1:1:8BPJ-WLN2&action=view&cc=3732506
Journal of the South African Veterinary Medical Association, 1927, Vol. 1(1), pp. 84-85, list of members; 1929, Vol. 1(3), pp. 77-83: Register of veterinarians of the Union of South Afica and South West Africa.
Natal [Colony]. Departmental Reports, 1904: Natal medical, dental, pharmacy and veterinary register, 1904.
Natal [Colony]. Report of the Principal Veterinary Surgeon, 1904, 1905/6.
Natal Agricultural Journal, 1904, Vol. 7, paper by Harber.
Natal civil service list, 1906.
National Automated Archival Information Retrieval System (NAAIRS). http://www.national.archives.gov.za/naairs.htm Documents relating to Harber, Augustus Frederick / Harber, A.F.
Posthumus, P.J. Past veterinarians in South Africa (10th edition), Vol. 2, [1992].
Union of South Africa. Public service list, 1914.