Snelling, L., & O'Karma, A. (2014). Opal: Dakotah treasures series, book 3 (Unabridged.). Recorded Books Inc..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSnelling, Lauraine, और Alexandra O'Karma. Opal: Dakotah Treasures Series, Book 3. Unabridged. Prince Frederick: Recorded Books Inc., 2014.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSnelling, Lauraine, और Alexandra O'Karma. Opal: Dakotah Treasures Series, Book 3. Unabridged. Recorded Books Inc., 2014.
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