- American Jesuit Spirituality: The Maryland Tradition, 1634-1900 (Sources of American Spirituality)
- The Bicentennial History of Georgetown University: From Academy to University 1789-1889 (Bicentennial History of Georgetown University)
- Papist Devils: Catholics in British America, 1574-1783
- John Dooley's Civil War: An Irish American's Journey in the First Virginia Infantry Regiment
- Catholics, the Civil War, and the Problem of the Lost Cause













