Concentrations 7: Deborah Butterfield, pamphlet, 1982; (https://texashistory.unt.edu/ark:/67531/metapth176556/m1/1/: accessed May 13, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Concentrations 7: Deborah Butterfield, pamphlet, 1982; (https://texashistory.unt.edu/ark:/67531/metapth176556/m1/1/: accessed May 13, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .