Spencer, S. (2010). The ring of death. Severn House.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSpencer, Sally. The Ring of Death. Sutton: Severn House, 2010.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSpencer, Sally. The Ring of Death. Severn House, 2010.
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