Não informado. (1979). Advances in agricultural technology. Agricultural Research Service.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Advances in Agricultural Technology. New Orleans, La: Agricultural Research Service, 1979.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Advances in Agricultural Technology. Agricultural Research Service, 1979.
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