Ibraheem, Mustafa Mohammed, et al. “Has Exogenous Melatonin Induce Histological Changes in Collecting Tubules and Ducts of rat’s Kidney?”. AL-Kindy College Medical Journal, vol. 6, no. 1, June 2010, pp. 132-7, https://jkmc.uobaghdad.edu.iq/index.php/MEDICAL/article/view/711.