Sproul, R. C. (2003). Defending your Faith: An introduction to apologetics. Crossway.
Lua i Stíl Chicago (17ú heag.)Sproul, R. C. Defending Your Faith: An Introduction to Apologetics. Wheaton, IL: Crossway, 2003.
Lua MLA (9ú heag.)Sproul, R. C. Defending Your Faith: An Introduction to Apologetics. Crossway, 2003.
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