Mass, W., & Turetsky, M. (2013). Pi in the sky (Unabridged.). Recorded Books Inc..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMass, Wendy, और Mark Turetsky. Pi in the Sky. Unabridged. Prince Frederick: Recorded Books Inc., 2013.
एमएलए (8वां संस्करण) प्रशस्ति पत्रMass, Wendy, और Mark Turetsky. Pi in the Sky. Unabridged. Recorded Books Inc., 2013.
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