Sayles, John. [Letter from John Sayles to M. McAlpine, January 13, 1915], letter, January 13, 1915; (https://texashistory.unt.edu/ark:/67531/metapth1154753/m1/1/: accessed July 3, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .