Nicholson, R. I., J. J. McGlone, and R. T. Ervin. “Economic Comparison of Pig Feedlot Housing Facilities in the Southern High Plains of Texas”. Texas Journal of Agriculture and Natural Resources, vol. 8, Nov. 2016, pp. 19-26, https://txjanr.agintexas.org/index.php/txjanr/article/view/253.