Não informado. (1975). Plant Research and Development. Institute for Scientific Co-operation.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Plant Research and Development. Tubingen, Alemanha: Institute for Scientific Co-operation, 1975.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Plant Research and Development. Institute for Scientific Co-operation, 1975.
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