[Letter from Thomas S. Berg on behalf of the Law Offices of Joseph A. Porto to John J. Herrera - 1977-10-12], letter, October 12, 1977; (https://texashistory.unt.edu/ark:/67531/metapth251573/m1/1/: accessed July 6, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .