Heitholt, J. J., and J. J. Sloan. “Enhancement of Vegetable Crop Growth With Biosolids and Yard-Waste Compost on a Calcareous Clay Soil”. Texas Journal of Agriculture and Natural Resources, vol. 19, May 2016, pp. 80-92, https://txjanr.agintexas.org/index.php/txjanr/article/view/114.