Owonubi, Ayodele. “Status of Micronutrients in Soils of a Basement Complex Area of Samaru, Zaria, Nigeria”. Ife Research Publications in Geography 9, no. 1 (June 1, 2010): 113–131. Accessed October 19, 2025. https://irpg.oauife.edu.ng/index.php/irpg/article/view/8.