Purnell, Adam L., Thayne Montague, Robert J. Wright, Cynthia McKenney, and David Wester. “Evidence of Relic Genotypes Persisting in the Texas Hybrid Swarm of Quercus Series Virentes”. Texas Journal of Agriculture and Natural Resources 34 (November 30, 2021): 21–36. Accessed January 21, 2022. https://txjanr.agintexas.org/index.php/txjanr/article/view/427.