Não informado. (2004). World helicopter and vertical flight. Air Age Publications.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. World Helicopter and Vertical Flight. London: Air Age Publications, 2004.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. World Helicopter and Vertical Flight. Air Age Publications, 2004.
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