Dungy, T., & Fernandez, P. J. (2008). Quiet strength: The principles, practices, and priorities of a winning life (Unabridged.). Recorded Books Inc..
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Dungy, Tony, و Peter Jay Fernandez. Quiet Strength: The Principles, Practices, and Priorities of a Winning Life. Unabridged. Prince Frederick: Recorded Books Inc., 2008.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Dungy, Tony, و Peter Jay Fernandez. Quiet Strength: The Principles, Practices, and Priorities of a Winning Life. Unabridged. Recorded Books Inc., 2008.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.