Mishra, Ila, and Vinod Kumar. “Role of Pineal and Melatonin in the Avian Circadian and Photoperiodic Systems”. Journal of Endocrinology and Reproduction 20, no. 1 (May 30, 2017): 38–45. Accessed December 9, 2022. https://informaticsjournals.com/index.php/jer/article/view/15478.