Foster, A. D. Ghosts of Yesterday. Del Rey Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रFoster, Alan Dean. Ghosts of Yesterday. Del Rey Books.
एमएलए (8वां संस्करण) प्रशस्ति पत्रFoster, Alan Dean. Ghosts of Yesterday. Del Rey Books.
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