Não informado. (2001). South African journal of plant and soil. Foundation for Education, Science and Technology.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. South African Journal of Plant and Soil. Pretoria, Africa do Sul: Foundation for Education, Science and Technology, 2001.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. South African Journal of Plant and Soil. Foundation for Education, Science and Technology, 2001.
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