Calkins, S. (2021). The sign of the gallows (First world edition.). Severn House.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCalkins, Susanna. The Sign of the Gallows. First world edition. London: Severn House, 2021.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCalkins, Susanna. The Sign of the Gallows. First world edition. Severn House, 2021.
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