Sproul, R. C. (2003). Defending your Faith: An introduction to apologetics. Crossway.
芝加哥风格引文Sproul, R. C. Defending Your Faith: An Introduction to Apologetics. Wheaton, IL: Crossway, 2003.
MLA引文Sproul, R. C. Defending Your Faith: An Introduction to Apologetics. Crossway, 2003.
警告：这些引文格式不一定是100％准确.