(2018). Northwest Aerospace News. Northwest Aerospace News.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNorthwest Aerospace News. Spokane, Wash.: Northwest Aerospace News, 2018.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNorthwest Aerospace News. Northwest Aerospace News, 2018.
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