1) Griffith, Bryce, Omernick & Rodgers (2007). Ecoregions of Texas. 2) Miller, George O., Landscaping with Native Plants of Texas 2nd Ed., 2013, pg 48. 3) Wasowski and Wasowski, Native Texas Plants Landscaping Region by Region, 1991, pg. 97. 4) https://www.wildflower.org/plants/result.php?id_plant=PIEC2. 5) https://portal.torcherbaria.org/portal/taxa/index.php?taxon=Pinus+echinata&formsubmit=Search+Terms. 6) http://bonap.net/TDC/Image/Map?taxonType=Species&taxonId=16929&locationType=County&mapType=Normal. 7) https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=183335#null
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