[Historic Marker Application: Simpson-Williamson House], text, 1986; (https://texashistory.unt.edu/ark:/67531/metapth460684/m1/7/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
[Historic Marker Application: Simpson-Williamson House], text, 1986; (https://texashistory.unt.edu/ark:/67531/metapth460684/m1/7/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .