The Rio Grande Herald (Rio Grande City, Tex.), Vol. 79, No. 23, Ed. 1 Thursday, April 20, 1989, newspaper, April 20, 1989; (https://texashistory.unt.edu/ark:/67531/metapth195181/m1/1/: accessed May 16, 2025), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .