Não informado. (1926). Farming in South Africa. Union of South Africa, Department of Agriculture.
Chicago-referens (17:e uppl.)Não informado. Farming in South Africa. Pretoria, Africa do Sul: Union of South Africa, Department of Agriculture, 1926.
MLA-referens (8:e uppl.)Não informado. Farming in South Africa. Union of South Africa, Department of Agriculture, 1926.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.