Não informado. (1959). Illinois research. University of Illinois at Urbana-Champaign, Agricultural Experiment Station.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Illinois Research. Urbana, Ill: University of Illinois at Urbana-Champaign, Agricultural Experiment Station, 1959.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Illinois Research. University of Illinois at Urbana-Champaign, Agricultural Experiment Station, 1959.
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