Alexander, E. (2012). Proof of heaven: A neurosurgeon's journey into the afterlife.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAlexander, Eben. Proof of Heaven: A Neurosurgeon's Journey into the Afterlife. 2012.
एमएलए (8वां संस्करण) प्रशस्ति पत्रAlexander, Eben. Proof of Heaven: A Neurosurgeon's Journey into the Afterlife. 2012.
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