Saya mau tau Smith, J.Z. (1998). dari Kekristenan

Spitz, Lewis. The Protestant Reformation. Concordia Publishing House (2003). .

Spurgeon, Charles. A Defense of Calvinism.

Sykes, Stephen; Booty, John; Knight, Jonathan. The Study of Anglicanism. Augsburg Fortress Publishers (1998). .

Talbott, Thomas. Three Pictures of God in Western Theology" (1995).

Ustorf, Werner. "A missiological postscript", in: McLeod, Hugh; Ustorf, Werner (ed.). The Decline of Christendom in Western Europe, 1750–2000. Cambridge University Press (2003).

Walsh, Chad. Campus Gods on Trial. edisi revisi dan diperbesar. New York: Macmillan Co., 1962, t.p. 1964. xiv, [4], 154 hlm.

Woodhead, Linda. An Introduction to Christianity.