University of Texas of the Permian Basin. The Windmill, Volume 8, Number 8, April/May 1982, periodical, April 1982; (https://texashistory.unt.edu/ark:/67531/metapth1033142/m1/4/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .