Asprey, D. (2017). Head strong: The bulletproof plan to boost brainpower, increase focus, and maximize performance—in just two weeks.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAsprey, Dave. Head Strong: The Bulletproof Plan to Boost Brainpower, Increase Focus, and Maximize Performance—in Just Two Weeks. 2017.
एमएलए (8वां संस्करण) प्रशस्ति पत्रAsprey, Dave. Head Strong: The Bulletproof Plan to Boost Brainpower, Increase Focus, and Maximize Performance—in Just Two Weeks. 2017.
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