[Perot Blue Poles Stair, 2021], photograph, 2021; (https://texashistory.unt.edu/ark:/67531/metadc2012760/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
[Perot Blue Poles Stair, 2021], photograph, 2021; (https://texashistory.unt.edu/ark:/67531/metadc2012760/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .