De gestis Pelagii?
A work on the proceedings of pelagius
A select library of the Nicene and Post-Nicene Fathers of the Christian Church. Edited by Philip Schaff, D.D., LL.D., Professor in the Union Theological Seminary, New York. In connection with a number of patristic scholars of Europe and America. Volume V - St. Augustin: Anti-Pelagian Writings. T&T Clark, Edinburgh, 1887 (Translation, Englisch)