Cushman, K., & Sterlin, J. (1996). Catherine, called birdy (Unabridged.). Recorded Books Inc..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCushman, Karen, और Jenny Sterlin. Catherine, Called Birdy. Unabridged. Prince Frederick: Recorded Books Inc., 1996.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCushman, Karen, और Jenny Sterlin. Catherine, Called Birdy. Unabridged. Recorded Books Inc., 1996.
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