[Telegram from Lady Bird Johnson to Mrs. James Henderson and Elizabeth Elward, September 12, 1964], letter, September 12, 1964; (https://texashistory.unt.edu/ark:/67531/metadc1614737/m1/2/: accessed June 25, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .