Cita APA (7a ed.)

Sproul, R. C. (2003). Defending your Faith: An introduction to apologetics. Crossway.

Cita Chicago Style (17a ed.)

Sproul, R. C. Defending Your Faith: An Introduction to Apologetics. Wheaton, IL: Crossway, 2003.

Cita MLA (9a ed.)

Sproul, R. C. Defending Your Faith: An Introduction to Apologetics. Crossway, 2003.