Douglas, I. (2021). Alien hostiles (First edition.). Harper Voyager, an imprint of HarperCollinsPublishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDouglas, Ian. Alien Hostiles. First edition. New York, New York: Harper Voyager, an imprint of HarperCollinsPublishers, 2021.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDouglas, Ian. Alien Hostiles. First edition. Harper Voyager, an imprint of HarperCollinsPublishers, 2021.
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