Sproul, R. C. (1982). Reason to believe. Zondervan Pub. House.
Lua i Stíl Chicago (17ú heag.)Sproul, R. C. Reason to Believe. Grand Rapids, Mich.: Zondervan Pub. House, 1982.
Lua MLA (9ú heag.)Sproul, R. C. Reason to Believe. Zondervan Pub. House, 1982.
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