Hitchcock, G., & Nielsen, S. (2020). The gray chamber, historical stories of american crime: True colors: historical stories of american crime series, book 4 (Unabridged.). Recorded Books Inc..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHitchcock, Grace, और Stina Nielsen. The Gray Chamber, Historical Stories of American Crime: True Colors: Historical Stories of American Crime Series, Book 4. Unabridged. Prince Frederick: Recorded Books Inc., 2020.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHitchcock, Grace, और Stina Nielsen. The Gray Chamber, Historical Stories of American Crime: True Colors: Historical Stories of American Crime Series, Book 4. Unabridged. Recorded Books Inc., 2020.
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