Não informado. (1948). Journal of the Institute of Navigation. Institute of Navigation.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Journal of the Institute of Navigation. London: Institute of Navigation, 1948.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Journal of the Institute of Navigation. Institute of Navigation, 1948.
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