Dungy, T., & Whitaker, N. (2007). Quiet strength: A memoir : [the principles, practices & priorities of a winning life]. Tyndale House Publishers.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDungy, Tony, और Nathan Whitaker. Quiet Strength: A Memoir : [the Principles, Practices & Priorities of a Winning Life]. Carol Stream, Ill.: Tyndale House Publishers, 2007.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDungy, Tony, और Nathan Whitaker. Quiet Strength: A Memoir : [the Principles, Practices & Priorities of a Winning Life]. Tyndale House Publishers, 2007.
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