Richardson, K., & Barron, M. (2009). Underground: Greywalker series, book 3 (Unabridged.). Recorded Books Inc..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रRichardson, Kat, और Mia Barron. Underground: Greywalker Series, Book 3. Unabridged. Prince Frederick: Recorded Books Inc., 2009.
एमएलए (8वां संस्करण) प्रशस्ति पत्रRichardson, Kat, और Mia Barron. Underground: Greywalker Series, Book 3. Unabridged. Recorded Books Inc., 2009.
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