Dallas (Tex.). Police Department. [Newspaper Clipping: Mattox to investigate new Kennedy theory, August 8, 1990], clipping, August 8, 1990; (https://texashistory.unt.edu/ark:/67531/metapth338349/m1/1/: accessed May 22, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .