Ringwald, W. (2015). The secret cipher /2. Katherine Tegen Books, an imprint of HarperCollins Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRingwald, Whitaker. The Secret Cipher /2. New York, NY: Katherine Tegen Books, an imprint of HarperCollins Publishers, 2015.
एमएलए (8वां संस्करण) प्रशस्ति पत्रRingwald, Whitaker. The Secret Cipher /2. Katherine Tegen Books, an imprint of HarperCollins Publishers, 2015.
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