Não informado. (1927). Abstracts from the Scientific and Technical Press. Royal Aeronautical Society.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Abstracts from the Scientific and Technical Press. London: Royal Aeronautical Society, 1927.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Abstracts from the Scientific and Technical Press. Royal Aeronautical Society, 1927.
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