Não informado. (1938). The American Biology Teacher. National Association of Biology Teachers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. The American Biology Teacher. Reston, Va: National Association of Biology Teachers, 1938.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. The American Biology Teacher. National Association of Biology Teachers, 1938.
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