Grey, Z., & Buka, D. (1990). Riders of the purple sage: Riders of the purple sage series, book 1 (Unabridged.). Recorded Books Inc..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGrey, Zane, और Donald Buka. Riders of the Purple Sage: Riders of the Purple Sage Series, Book 1. Unabridged. Prince Frederick: Recorded Books Inc., 1990.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGrey, Zane, और Donald Buka. Riders of the Purple Sage: Riders of the Purple Sage Series, Book 1. Unabridged. Recorded Books Inc., 1990.
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