- (book) "Death In Rome: The First Revelation of One of the Most Horrible and Still Contoversial Episodes in World War II - the Ardeatine Caves Massacre in the Eternal City of Rome". New York: Macmillan, 1967.
- (book) "Black Sabbath: A Journey Through a Crime Against Humanity". New York: The Macmillan Company. 1969.
- (book) "The Fall of the House of Savoy: The Final Struggle of an Italian Dynasty to Preserve its 900-Year Tradition". New York: MacMillan Publishing Company, 1971. ISBN-10: 0025607707; ISBN-13: 9780025607705
- (book) "A Giant in the Earth". New York: Stein & Day, 1973. ISBN-10: 0812815211; ISBN-13: 9780812815214
- (book) "Days of Wrath: The Ordeal of Aldo Moro, the Kidnapping, the Execution, the Aftermath". Doubleday, 1980. ISBN-10: 0385149107; ISBN-13: 9780385149105
- (book; coauthor Peter Berling) "Love Is Colder Than Death: Life and Times of Rainer Werner Fassbinder". London: Jonathan Cape, 1987. ISBN-10: 0224021745 ISBN-13: 9780224021746
- (book) "Naked by the Window: The Fatal Marriage of Carl Andre and Ana Mendieta". Boston, MA: Atlantic Monthly Press, 1990. ISBN-10: 0871133547; ISBN-13: 9780871133540
- (book) "The Battle for Rome: The Germans, the Allies, the Partisans, and the Pope, September 1943-June 1944". New York: Simon & Schuster, 2003. ISBN-10: 0743216423; ISBN-13: 9780743216425
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