Não informado. (2001). South African journal of plant and soil. Foundation for Education, Science and Technology.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. South African Journal of Plant and Soil. Pretoria, Africa do Sul: Foundation for Education, Science and Technology, 2001.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. South African Journal of Plant and Soil. Foundation for Education, Science and Technology, 2001.
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