Kumar, K. Prashanth, et al. “Efficacy of Supplementing Ashwgandha Extract (Withania Somnifera) on Immunity and Serum Biochemistry in Broilers During Summer”. International Journal of Livestock Research, vol. 8, no. 9, Sept. 2018, pp. 158-64, http://ijlr.org/ojs_journal/index.php/ijlr/article/view/1603.