Haldar, C. and Singh, S. S. (2001) “Seasonal Changes in Melatonin and Immunological Adaptations in Birds”, Journal of Endocrinology and Reproduction, 5(1&2), pp. 13–24. Available at: http://informaticsjournals.com/index.php/jer/article/view/4432 (Accessed: 2 May 2024).