Asprey, D. (2017). Head strong: The bulletproof plan to activate untapped brain energy to work smarter and think faster-in just two weeks (Unabridged.).
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAsprey, Dave. Head Strong: The Bulletproof Plan to Activate Untapped Brain Energy to Work Smarter and Think Faster-in Just Two Weeks. Unabridged. 2017.
एमएलए (8वां संस्करण) प्रशस्ति पत्रAsprey, Dave. Head Strong: The Bulletproof Plan to Activate Untapped Brain Energy to Work Smarter and Think Faster-in Just Two Weeks. Unabridged. 2017.
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