KHAWLA A.H. SHAMERAN MSC, et al. “Effect of Mode of Delivery on the Level of Zinc Copper Superoxide Dismutase in Umbilical Cord Blood”. International Journal of Pharma and Bio Sciences, vol. 7, no. 4, Dec. 2016, pp. 825-30, https://ijpbs.net/index.php/journal/article/view/5560.