Gongruttananun, N. ., and P. . Guntapa. “Effects of Red Light Illumination on Productivity, Fertility, Hatchability and Energy Efficiency of Thai Indigenous Hens”. Agriculture and Natural Resources, vol. 46, no. 1, Feb. 2012, pp. 51-63, https://li01.tci-thaijo.org/index.php/anres/article/view/242746.