Não informado. (1926). Farming in South Africa. Union of South Africa, Department of Agriculture.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Farming in South Africa. Pretoria, Africa do Sul: Union of South Africa, Department of Agriculture, 1926.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Farming in South Africa. Union of South Africa, Department of Agriculture, 1926.
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