Ribchester, L. (2016). The hourglass factory (First Pegasus Books hardcover edition.). Pegasus Crime, an imprint of Pegasus Books LLC.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRibchester, Lucy. The Hourglass Factory. First Pegasus Books hardcover edition. New York, NY: Pegasus Crime, an imprint of Pegasus Books LLC, 2016.
एमएलए (8वां संस्करण) प्रशस्ति पत्रRibchester, Lucy. The Hourglass Factory. First Pegasus Books hardcover edition. Pegasus Crime, an imprint of Pegasus Books LLC, 2016.
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