Não informado. (2000). Bulletin of the West Virginia University Agricultural Experiment Station. West Virginia Agricultural Experiment Station.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Bulletin of the West Virginia University Agricultural Experiment Station. Morgantown, Va: West Virginia Agricultural Experiment Station, 2000.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Bulletin of the West Virginia University Agricultural Experiment Station. West Virginia Agricultural Experiment Station, 2000.
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