- *The Assassination of John F. Kennedy:The Theories and the Evidence* (New York:Lyle Stuart, 1966)
- *Hiroshima:The Decision to Drop the Bomb* (New York:Pyramid Books, 1968)
- *The Bataan Death March:A Survivor's Account* (New York:Pyramid Books, 1970)
- *The Pearl Harbor Papers:Inside the U.S. Government's Cover-Up* (New York:Dodd, Mead &Company, 1974)
- *Vietnam Diary:The Secret Diary of the U.S. Ambassador* (New York:Lyle Stuart, 1979)
- *The New York Times Guide to the Presidentship* (New York:Atheneum, 1981)
- *Encyclopedia of American Presidents* (New York:Harper &Row, 1984)
- *White House Confidential:The Hidden Lives of the American Presidents* (New York:Arbor House, 1989)
- *The Great Presidential Trivia Book* (New York:Carol Publishing Group, 1991)
- *Præsidentielle citater:En kildebog* (New York:H.W. Wilson, 1992)
- *The Presidents' Wives* (New York:HarperCollins, 1994)
- *The Kennedys:En førstehåndsberetning om deres historiske år i Washington* (New York:Random House, 2001)
- *America's Presidents:A Reference Guide* (New York:Facts On File, 2004)
- *White House Kids:The Lives of America's First Families* (New York:Skyhorse Publishing, 2011)