United States. Bureau of the Census. 2000 Census County Subdivison Block Map: Waller CCD, Texas, Block 4, map, 2000; (https://texashistory.unt.edu/ark:/67531/metapth419012/m1/1/: accessed July 11, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .