Westmoreland asking for more support
James S. Olsen, Randy Roberts. Where the Domino Fell: America and Vietnam 1945-2010 (Chichester, UK: John Wiley & Sons, 2014), 138.
Decrease in war support
Schreiber, E. M. “Anti-War Demonstrations and American Public Opinion on the War in Vietnam.” The British Journal of Sociology 27, no. 2 (1976): 228.
Gallup Polls
George Gallup, “57% Oppose LBJ’s Handling of War,” The Washington Post, 1967.