Avi & Keith, R. (2006). At the edge of the world (Unabridged.). Recorded Books Inc..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAvi और Ron Keith. At the Edge of the World. Unabridged. Prince Frederick: Recorded Books Inc., 2006.
एमएलए (8वां संस्करण) प्रशस्ति पत्रAvi और Ron Keith. At the Edge of the World. Unabridged. Recorded Books Inc., 2006.
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