Não informado. (2018). Professional Papers of the Signal Service. Chief Signal Officer.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Professional Papers of the Signal Service. Washington: Chief Signal Officer, 2018.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Professional Papers of the Signal Service. Chief Signal Officer, 2018.
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