Não informado. (1923). Minnesota Studies in Plant Science. University of Minnesota.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Minnesota Studies in Plant Science. Minneapolis, Minn: University of Minnesota, 1923.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Minnesota Studies in Plant Science. University of Minnesota, 1923.
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