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Simple Monotheism
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Jesus Christ is not GodJesus Christ is not God by Victor Paul Wierwille
Buy used from: $27.98
An easily accessible introduction for the layperson.
The Doctrine of the Trinity: Christianity's Self-Inflicted WoundThe Doctrine of the Trinity: Christianity's Self-Inflicted Wound by Sir Anthony Buzzard
Buy new: $12.00 / Used from: $19.99
When Jesus Became God: The Struggle to Define Christianity during the Last Days of RomeWhen Jesus Became God: The Struggle to Define Christianity during the Last Days of Rome by Richard E. Rubenstein
Buy new: $10.20 / Used from: $3.49
A history of the early controversy over the doctrine of the Trinity, and how the orthodox view emerged as dominate.
Triads and TrinityTriads and Trinity by J. Gwyn Griffiths
Buy used from: $99.95
An excellent scholarly source examining the possible sources of the doctrine of the Trinity.
One God, One Lord: Early Christian Devotion and Ancient Jewish MonotheismOne God, One Lord: Early Christian Devotion and Ancient Jewish Monotheism by Larry W. Hurtado
Buy new: $39.80 / Used from: $37.79
How On Earth Did Jesus Become A God?: Historical Questions About Earliest Devotion To JesusHow On Earth Did Jesus Become A God?: Historical Questions About Earliest Devotion To Jesus by Larry W. Hurtado
Buy new: $14.96 / Used from: $10.00
One God & One Lord : Reconsidering the Cornerstone of the Christian FaithOne God & One Lord : Reconsidering the Cornerstone of the Christian Faith by John W. Schoenheit
Buy new: $29.00 / Used from: $23.95
I haven't read this, but it was written by students of Victor Paul Weirwille and is likely much like Jesus Christ Is Not God.
At the Origins of Christian Worship: The Context and Character of Earliest Christian DevotionAt the Origins of Christian Worship: The Context and Character of Earliest Christian Devotion by Larry W. Hurtado
Buy new: $14.04 / Used from: $7.49
Jesus-God or the Son of God? A Comparison of the ArgumentsJesus-God or the Son of God? A Comparison of the Arguments by Brian Holt
Buy new: $19.99 / Used from: $18.97
Present Trinitarian or a non-Trinitarian arguments in a point, counter point manner.
The Orthodox Corruption of Scripture: The Effect of Early Christological Controversies on the Text of the New TestamentThe Orthodox Corruption of Scripture: The Effect of Early Christological Controversies on the Text of the New Testament by Bart D. Ehrman
Buy new: $22.50 / Used from: $20.90
Details how orthodox scribes altered biblical texts to support their views.
The Lost Christianities: The Battles for Scripture and the Faiths We Never KnewThe Lost Christianities: The Battles for Scripture and the Faiths We Never Knew by Bart D. Ehrman
Buy used from: $3.11
Explores the lack of monolithic Christian orthodoxy before the fourth century.
Our Unitarian heritage;: An introduction to the history of the Unitarian movementOur Unitarian heritage;: An introduction to the history of the Unitarian movement by Earl Morse Wilbur
Archetypal Heresy: Arianism through the CenturiesArchetypal Heresy: Arianism through the Centuries by Maurice Wiles
Buy new: $48.00 / Used from: $36.99
Arius: Heresy and TraditionArius: Heresy and Tradition by Rowan Williams
Buy new: $29.92 / Used from: $22.89
The Search for the Christian Doctrine of God: The Arian Controversy, 318-381The Search for the Christian Doctrine of God: The Arian Controversy, 318-381 by R. Hanson
Buy new: $37.12 / Used from: $35.00