K. Arap Tonui, Mathew, Isaac W. Mwangi, and Ruth Wanjau. “Recovery of Zn2+, Fe2+ and Mn2+ from Some Selected Edible Vegetables and Pumpkin Using Modified Maize Cobs”. American Scientific Research Journal for Engineering, Technology, and Sciences 51, no. 1 (January 14, 2019): 86–102. Accessed September 20, 2025. https://asrjetsjournal.org/American_Scientific_Journal/article/view/4602.