Amos-Tautua, Bamidele Martin W, and Onigbinde Adebayo O. 2014. “Estimation of Iron, Copper and Zinc in Some Vegetables Commonly Consumed in Amassoma, Niger Delta, Nigeria”. Pakistan Journal of Nutrition 13 (12): 742–745. https://doi.org/10.3923/pjn.2014.742.745.