Sagan, C. (2019). Contact (First Gallery Books trade paperback edition.). Gallery Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSagan, Carl. Contact. First Gallery Books trade paperback edition. New York: Gallery Books, 2019.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSagan, Carl. Contact. First Gallery Books trade paperback edition. Gallery Books, 2019.
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