Cita APA (7a ed.)

Petrillo, G., & Lyon, L. (2007). Keep your ear on the ball (1st hardcover ed.). Tilbury House.

Cita Chicago Style (17a ed.)

Petrillo, Genevieve, y Lea Lyon. Keep Your Ear on the Ball. 1st hardcover ed. Gardiner, Me.: Tilbury House, 2007.

Cita MLA (8a ed.)

Petrillo, Genevieve, y Lea Lyon. Keep Your Ear on the Ball. 1st hardcover ed. Tilbury House, 2007.

Precaución: Estas citas no son 100% exactas.