William Duffield

• Letter to the Rev. W. Withers Ewbank, B.A., of Christ's College, Cambridge ... occasioned by the remarks on Unitarians and Unitarianism
• Second letter to the Rev. W. Withers Ewbank, B.A., of Christ's College, Cambridge ... containing a brief defence of the Unitarian faith and an examination of the evidences advanced in his sermon in favor of the Trinitarian faith
• Unitarianism, a system of pure gospel truth