Ghani, Abdul, Ameen Ullah Shah, and Umer Akhtar. “Effect of Lead Toxicity on Growth, Chlorophyll and Lead (Pb+) Contents of Two Varieties of Maize (Zea Mays L.)”. Pakistan Journal of Nutrition 9, no. 9 (August 15, 2010): 887–891. Accessed July 27, 2025. https://pjnonline.org/pjn/article/view/1286.