Não informado. (2000). Research Bulletin. Massachusetts Agricultural Experiment Station.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Research Bulletin. Amherst, Mass: Massachusetts Agricultural Experiment Station, 2000.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Research Bulletin. Massachusetts Agricultural Experiment Station, 2000.
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