Não informado. (1971). COMSAT technical review. Communications Satellite Corporation.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. COMSAT Technical Review. Clarksburg, Md: Communications Satellite Corporation, 1971.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. COMSAT Technical Review. Communications Satellite Corporation, 1971.
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