McDougall, C., & Smith, N. G. (2015). Natural born heroes: How a daring band of misfits mastered the lost secrets of strength and endurance (Unabridged.). Random House Audio.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)McDougall, Christopher, و Nicholas Guy Smith. Natural Born Heroes: How a Daring Band of Misfits Mastered the Lost Secrets of Strength and Endurance. Unabridged. New York: Random House Audio, 2015.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)McDougall, Christopher, و Nicholas Guy Smith. Natural Born Heroes: How a Daring Band of Misfits Mastered the Lost Secrets of Strength and Endurance. Unabridged. Random House Audio, 2015.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.