Clases duales, text, November 2, 2006; (https://texashistory.unt.edu/ark:/67531/metapth91137/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Clases duales, text, November 2, 2006; (https://texashistory.unt.edu/ark:/67531/metapth91137/m1/1/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .