Gharib, H.B.A., A.A. Desoky, M.A. El-Menawey, Ahmed. O. Abbas, G.L. Hendricks, and M.M. Mashaly. 2008. “The Role of Photoperiod and Melatonin on Alleviation of the Negative Impact of Heat Stress on Broilers”. International Journal of Poultry Science 7 (8): 749–756. https://doi.org/10.3923/ijps.2008.749.756.