Gupta, S. (2020). Keep sharp: How to build a better brain at any age (Unabridged.). Simon & Schuster Audio.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGupta, Sanjay. Keep Sharp: How to Build a Better Brain at Any Age. Unabridged. [New York]: Simon & Schuster Audio, 2020.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGupta, Sanjay. Keep Sharp: How to Build a Better Brain at Any Age. Unabridged. Simon & Schuster Audio, 2020.
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