[Letter from Richard A. Sprague to Chief of Police Don Byrd, October 7, 1976], legal document, October 7, 1976; (https://texashistory.unt.edu/ark:/67531/metapth339084/m1/1/: accessed April 28, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .