29. George C. Herring, America's Longest War: The United States and Vietnam, 1950–1975 (4th ed., New York, 2002), 37–45; George C. Herring and Richard H. Immerman, "Eisenhower, Dulles, and Dienbienphu: 'The Day We Didn't Go to War' Revisited," Journal of American History 71 (September 1984), 343–63.