Não informado. (1977). South African journal of chemistry. Foundation for Education, Science and Technology.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. South African Journal of Chemistry. Pretoria, Africa do Sul: Foundation for Education, Science and Technology, 1977.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. South African Journal of Chemistry. Foundation for Education, Science and Technology, 1977.
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