Yerima, Emmanuel Amuntse, and Soken Martin Luka. “Comparative Evaluation of Heavy Metals Bioconcentrations in Spinach Grown on Cow Dung-Enhanced and NPK-Enhanced Soils”. UMYU Scientifica 4, no. 2 (June 30, 2025): 360–368. Accessed April 13, 2026. https://publications.umyu.edu.ng/scientifica/index.php/usci/article/view/105.