Schumacher, T. (2014). The darkest hour (First edition.). William Morrow, an imprint of HarperCollinsPublishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSchumacher, Tony. The Darkest Hour. First edition. New York, NY: William Morrow, an imprint of HarperCollinsPublishers, 2014.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSchumacher, Tony. The Darkest Hour. First edition. William Morrow, an imprint of HarperCollinsPublishers, 2014.
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