Sources of the Apostolic Canon: with a Treatise on the Origin of the Readership and Other Lower Orders

Cold-Case Christianity: A Homicide Detective Investigates the Claims of the Gospels

The Letter of the Roman Church to the Corinthian Church from the Era of Domitian: 1 Clement: With a Collection of Articles on 1 Clement by Adolf von Harnack

Zealot: The Life and Times of Jesus of Nazareth

The Cost of Discipleship

History of Dogma, Volume 1

Essential Gnostic Scriptures

Bible Reading in the Early Church

What It Means to Be Protestant: The Case for an Always-Reforming Church

The Apostles' Creed

The New Testament in Its World: An Introduction to the History, Literature, and Theology of the First Christians

Luke the Physician: The Author of the Third Gospel and the Acts of the Apostles

The Pilgrim's Progress: From This World to That Which is to Come

Outlines of the History of Dogma

Learning Theology with the Church Fathers

The Origin of the New Testament: and the most important consequences of the new creation

The Gnostic Bible: Revised and Expanded Edition

The Date of the Acts and the Synoptic Gospels

Beyond Belief: The Secret Gospel of Thomas