Cita APA (7th ed.)

Pennington, M. B. (1990). Call to the center: The Gospel's invitation to deeper prayer. Doubleday.

Cita Chicago (17th ed.)

Pennington, M. Basil. Call to the Center: The Gospel's Invitation to Deeper Prayer. New York: Doubleday, 1990.

Cita MLA (9th ed.)

Pennington, M. Basil. Call to the Center: The Gospel's Invitation to Deeper Prayer. Doubleday, 1990.