Ugwuja, Emmanuel I., Emmanuel I. Akubugwo, Udu A. Ibiam, and Onyechi Obidoa. “Impact of Maternal Copper and Zinc Status on Pregnancy Outcomes in a Population of Pregnant Nigerians”. Pakistan Journal of Nutrition 9, no. 7 (June 15, 2010): 678–682. Accessed September 11, 2025. https://pjnonline.org/pjn/article/view/1247.