Não informado. (1919). Plant Disease Reporter. Agricultural Research Service.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Plant Disease Reporter. Washington: Agricultural Research Service, 1919.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Plant Disease Reporter. Agricultural Research Service, 1919.
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