"Cibolo Creek". Handbook of Texas Online. Texas State Historical Association. February 22, 2010. Retrieved 15 March 2010.
Thonhoff, Robert (February 22, 2010). "Fuerte de Santa Cruz del CĂbolo". Handbook of Texas Online. Texas State Historical Association. Retrieved 16 March 2010.
Bill Groneman, "DESAUQUE, FRANCIS L.," Handbook of Texas Online[2], accessed July 14, 2012. Published by the Texas State Historical Association.
Smyrl, Vivian Elizabeth (February 22, 2010). "Schertz, Texas". Handbook of Texas Online. Texas State Historical Association. Retrieved 16 March 2010.
Duerson, Lawrence W. (February 22, 2010). "Universal City, Texas". Handbook of Texas Online. Texas State Historical Association. Retrieved 16 March 2010.
universalcitytexas.com
"Parks and Recreation". UniversalCityTexas.com. Universal City, Texas. Retrieved 4 April 2010.
utexas.edu
Smith, A. Richard; George Veni. "Karst Regions of Texas". Texas Speleological Survey. University of Texas. Retrieved 3 April 2010.
utsa.edu
research.utsa.edu
"Cibolo Preserve"(PDF). University of Texas at San Antonio. Archived from the original(PDF) on 28 June 2011. Retrieved 17 May 2011.