Asprey, D. (2016). Head strong: The bulletproof plan to activate untapped brain energy to work smarter and think faster-in just two weeks (First edition.). Harper Wave.
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. First edition. New York, NY: Harper Wave, 2016.
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. First edition. Harper Wave, 2016.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.