"Golden Booklet of the True Christian Life" by John Calvin, Baker Books, a division of Baker Publishing Group, Grand Rapids, Michingan, United States, (p. 45), December 1, 2004.
John Calvin (2009). “Institutes of the Christian Religion Vol. 1: Translated from the Original Latin, and Collated With the Author's Last Edition in French”, p.623, Wipf and Stock Publishers