Athens on Trial: Antidemocratic Tradition in Western Thought (Princeton, 1994).
Herodotus "The Histories" (edited with Walter Blanco, W. W. Norton, 1992).
Civilizations of the West, (with Richard Greaves and Robert Zaller, Harper Collins, New York, 1992) (Second eds. forthcoming 1996).
Accountability in Athenian Government, (University of Wisconsin Press, Madison, 1982).
De Vidua Christiana in Collected Works of Erasmus, 66: Spiritualia, University of Toronto Press, ed. John O'Malley, 1988, 178-257 and 319-331. Translation and introduction by Roberts, footnotes by Robert and O'Malley.