Não informado. (1940). Agricultural Science and Genetics Newsletter. U.S. Department of Agriculture.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Agricultural Science and Genetics Newsletter. Cold Spring Harbor, NY: U.S. Department of Agriculture, 1940.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Agricultural Science and Genetics Newsletter. U.S. Department of Agriculture, 1940.
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