Não informado. (1933). American Physics Teacher. American Association of Physics Teachers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. American Physics Teacher. New York: American Association of Physics Teachers, 1933.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. American Physics Teacher. American Association of Physics Teachers, 1933.
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