Jeffries, S., & Crick, B. A. (2019). Project duchess (Unabridged.). Recorded Books Inc..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रJeffries, Sabrina, और Beverley A. Crick. Project Duchess. Unabridged. Prince Frederick: Recorded Books Inc., 2019.
एमएलए (8वां संस्करण) प्रशस्ति पत्रJeffries, Sabrina, और Beverley A. Crick. Project Duchess. Unabridged. Recorded Books Inc., 2019.
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