Bolen, Eric G.; Smith, Loren M.; Schramm, Harold L. (October 1989). "Playa Lakes: Prairie Wetlands of the Southern High Plains". BioScience. 39 (9): 615–623. doi:10.2307/1311091. JSTOR1311091.
Proctor, Vernon W. (January 1990). "Characeae of Llano Estacado (Texas and Adjacent New Mexico) Playas". Journal of Biogeography. 17 (1): 75–84. doi:10.2307/2845189. JSTOR2845189.
"Ecoregions of Texas"(PDF). Reston, Virginia: U.S. Geological Survey. 2004. As depicted by items 25i,25j,25k on the map in conjunction with a county names map. Retrieved 1 October 2013.
water.epa.gov
Playa Lakes United States Environmental Protection Agency. Retrieved: 2012-10-15.
Bolen, Eric G.; Smith, Loren M.; Schramm, Harold L. (October 1989). "Playa Lakes: Prairie Wetlands of the Southern High Plains". BioScience. 39 (9): 615–623. doi:10.2307/1311091. JSTOR1311091.
Proctor, Vernon W. (January 1990). "Characeae of Llano Estacado (Texas and Adjacent New Mexico) Playas". Journal of Biogeography. 17 (1): 75–84. doi:10.2307/2845189. JSTOR2845189.
"Texas Conservation Action Plan Ecoregions"(PDF). As depicted by the southern half of the High Plains--in conjunction with an aerial map of the region: Texas Parks and Wildlife Department. 20 May 2011. Retrieved 1 October 2013.