Okigbo, Ebele Chinelo, and Odiri E. Onoshakpokaiye. “Relationship Between Academic Self-Concept and Academic Performance in Mathematics of Secondary School Students in Delta State, Nigeria”. Indonesian Journal of Mathematics Education 6, no. 2 (November 5, 2023): 63–71. Accessed May 18, 2024. https://journal.untidar.ac.id/index.php/ijome/article/view/991.