Berry, T. M. (1999). The great work: Our way into the future. Bell Tower.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBerry, Thomas Mary. The Great Work: Our Way into the Future. New York: Bell Tower, 1999.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBerry, Thomas Mary. The Great Work: Our Way into the Future. Bell Tower, 1999.
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