Petrillo, G., & Lyon, L. (2007). Keep your ear on the ball (1st hardcover ed.). Tilbury House.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPetrillo, Genevieve, और Lea Lyon. Keep Your Ear on the Ball. 1st hardcover ed. Gardiner, Me.: Tilbury House, 2007.
एमएलए (8वां संस्करण) प्रशस्ति पत्रPetrillo, Genevieve, और Lea Lyon. Keep Your Ear on the Ball. 1st hardcover ed. Tilbury House, 2007.
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