Guthrie, T. E. (1847). The apology of T.E. Guthrie, late a Protestant: Of the parish of Abbey, Clonmel, containing a brief account of his conversion to the Catholic faith, and the principal arguments by which he was influenced to change his religion (2nd ed.). pr. by William Barrett, Old Bridge.

Guthrie, Thomas Eyres. The Apology of T.E. Guthrie, Late a Protestant: Of the Parish of Abbey, Clonmel, Containing a Brief Account of His Conversion to the Catholic Faith, and the Principal Arguments by Which He Was Influenced to Change His Religion. 2nd ed. pr. by William Barrett, Old Bridge, 1847.