Webb, B. (2018). The otter of death: A Gunn Zoo mystery (First edition.). Poisoned Pen Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWebb, Betty. The Otter of Death: A Gunn Zoo Mystery. First edition. Scottsdale, AZ: Poisoned Pen Press, 2018.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWebb, Betty. The Otter of Death: A Gunn Zoo Mystery. First edition. Poisoned Pen Press, 2018.
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