Dungy, T., & Fernandez, P. J. (2008). Quiet strength: The principles, practices, and priorities of a winning life (Unabridged.). Recorded Books Inc..
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDungy, Tony, और Peter Jay Fernandez. Quiet Strength: The Principles, Practices, and Priorities of a Winning Life. Unabridged. Prince Frederick: Recorded Books Inc., 2008.
एमएलए (8वां संस्करण) प्रशस्ति पत्रDungy, Tony, और Peter Jay Fernandez. Quiet Strength: The Principles, Practices, and Priorities of a Winning Life. Unabridged. Recorded Books Inc., 2008.
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