- Princes of the Renaissance: A Chronicle of the Private Lives and Public Careers of the Kings, Dukes, Popes and Despots Who Ruled Italy in the Fifteenth Century
- The Undying Past
- In My Opinion: An Inquiry into the Contemporary Novel (Essay index reprint series)
- Lords of Italy: Portraits from the Middle Ages
- A Father Reads to His Children: An Anthology of Prose and Poetry.