Duff, K. (2014). The secret life of sleep (First Atria Books/Beyond Words hardcover edition.). Atria Books ; Beyond Words.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDuff, Kat. The Secret Life of Sleep. First Atria Books/Beyond Words hardcover edition. New York : Hillsboro, Oregon: Atria Books ; Beyond Words, 2014.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDuff, Kat. The Secret Life of Sleep. First Atria Books/Beyond Words hardcover edition. Atria Books ; Beyond Words, 2014.
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