Erickson, J. R. (2014). The case of the three rings (Unabridged.). Maverick Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रErickson, John R. The Case of the Three Rings. Unabridged. Perryton, TX: Maverick Books, 2014.
एमएलए (8वां संस्करण) प्रशस्ति पत्रErickson, John R. The Case of the Three Rings. Unabridged. Maverick Books, 2014.
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