Upson, N. (2020). The secrets of winter (First North American edition.). Crooked Lane.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUpson, Nicola. The Secrets of Winter. First North American edition. New York: Crooked Lane, 2020.
एमएलए (8वां संस्करण) प्रशस्ति पत्रUpson, Nicola. The Secrets of Winter. First North American edition. Crooked Lane, 2020.
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