Não informado. (1957). Journal of the Astronautical Sciences. American Astronautical Society.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Journal of the Astronautical Sciences. New York: American Astronautical Society, 1957.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Journal of the Astronautical Sciences. American Astronautical Society, 1957.
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