Griffin, Edward L.; Sabo, Donald J.; Brezina, Dennis N. & Janak, Edward L. Soil Survey of Limestone County, Texas, book, 1997; (https://texashistory.unt.edu/ark:/67531/metapth130231/m1/25/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .