Spiares, J. D., K. E. Kenworthy, and R. L. Rhykerd. “Emergence and Height of Plants Seeded in Crude Oil Contaminated Soil”. Texas Journal of Agriculture and Natural Resources, vol. 14, May 2016, pp. 37-46, https://txjanr.agintexas.org/index.php/txjanr/article/view/162.