SUPAKORN, C., and S. THONGPASSANO. “Effect of Dried Porcine Placenta on Growth Performance in Post-Weaning Pigs”. Walailak Journal of Science and Technology (WJST), vol. 8, no. 2, Nov. 2011, pp. 167-73, https://wjst.wu.ac.th/index.php/wjst/article/view/18.