Não informado. (1956). Journal of the American Helicopter Society. American Helicopter Society.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Journal of the American Helicopter Society. Washington: American Helicopter Society, 1956.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Journal of the American Helicopter Society. American Helicopter Society, 1956.
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