Brett, P. V. (2015). The skull throne: Book four of the demon cycle.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBrett, Peter V. The Skull Throne: Book Four of the Demon Cycle. 2015.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBrett, Peter V. The Skull Throne: Book Four of the Demon Cycle. 2015.
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