South Dakota Agricultural Experiment Station. (1939). Technical bulletin. Agricultural Experiment Station, South Dakota State College of Agriculture and Mechanical Arts.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSouth Dakota Agricultural Experiment Station. Technical Bulletin. Brookings, S.D.: Agricultural Experiment Station, South Dakota State College of Agriculture and Mechanical Arts, 1939.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSouth Dakota Agricultural Experiment Station. Technical Bulletin. Agricultural Experiment Station, South Dakota State College of Agriculture and Mechanical Arts, 1939.
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