Huo, X., and . P. Na-Lampang. “Effects of Stocking Density on Feather Pecking and Aggressive Behavior in Thai Crossbred Chickens”. Agriculture and Natural Resources, vol. 50, no. 5, Oct. 2016, pp. 396-9, https://li01.tci-thaijo.org/index.php/anres/article/view/244123.