Keller, T. (2008). The reason for God: Belief in an age of skepticism. Dutton.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKeller, Timothy. The Reason for God: Belief in an Age of Skepticism. New York: Dutton, 2008.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKeller, Timothy. The Reason for God: Belief in an Age of Skepticism. Dutton, 2008.
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