Sproul, R. C. (1997). Grace unknown: The heart of reformed theology. Baker.
芝加哥风格引文Sproul, R. C. Grace Unknown: The Heart of Reformed Theology. Grand Rapids: Baker, 1997.
MLA引文Sproul, R. C. Grace Unknown: The Heart of Reformed Theology. Baker, 1997.
警告:这些引文格式不一定是100%准确.