Asprey, D. (2017). Head strong: The bulletproof plan to activate untapped brain energy to work smarter and think faster-in just two weeks (Unabridged.).
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Asprey, Dave. Head Strong: The Bulletproof Plan to Activate Untapped Brain Energy to Work Smarter and Think Faster-in Just Two Weeks. Unabridged. 2017.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Asprey, Dave. Head Strong: The Bulletproof Plan to Activate Untapped Brain Energy to Work Smarter and Think Faster-in Just Two Weeks. Unabridged. 2017.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.