Não informado. (1949). South Dakota Farm & Home Research. South Dakota Agricultural Experiment Station.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. South Dakota Farm & Home Research. Brookings, SD: South Dakota Agricultural Experiment Station, 1949.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. South Dakota Farm & Home Research. South Dakota Agricultural Experiment Station, 1949.
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