Theology and Contemporary Art Forms.
Word, 1971.

Christianity and Contemporary Art Forms.
Word, 1979.

Demons, Demons, Demons: A Christian Guide Through the Murky Maze of the Occult.
Broadman, 1972.

Why Christians Fight Over the Bible.
Thomas Nelson, 1974.

Christ and the New Consciousness.
Broadman, 1978.

Nineteenth Century Devotional Thought.
Broadman, 1981.

Paul Tillich.
Word, 1984.

What Is Christian Doctrine?
Broadman, 1984.

The Lion and the Lamb: A Commentary on the Book of Revelation for Today.
Broadman, 1986.

Life’s Ultimate Questions: A Contemporary Philosophy of Religion.
Word 1989.

The New Age Movement and the Biblical Worldview: Conflict and Dialogue.
Eerdmans, 1998.