Não informado. (1891). Bulletin of the Washington Agricultural Experiment Station. Washington Agricultural Experiment Station.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Bulletin of the Washington Agricultural Experiment Station. Pullman, Wash: Washington Agricultural Experiment Station, 1891.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Bulletin of the Washington Agricultural Experiment Station. Washington Agricultural Experiment Station, 1891.
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