Coburn, C. A., B. J. May, D. R. Shelby, C. B. Scott, and G. R. Engdahl. “Effects of Penned Vs. Pasture Feeding Techniques on Cortisol Levels in Weaned Angus Bulls”. Texas Journal of Agriculture and Natural Resources, vol. 10, Oct. 2016, pp. 93-100, https://txjanr.agintexas.org/index.php/txjanr/article/view/236.