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