Saint Thomas Aquinas
His works have been widely translated, the more important ones in various versions. Volumes of selections of his works are also available. See G. K. Chesterton, St. Thomas Aquinas (1933); E. Gilson, The Christian Philosophy of St. Thomas Aquinas (1956); M. D. Chenu, Toward Understanding St. Thomas (1964); J. A. Weisheipl, Friar Thomas D'Aquino (1974).