Okigbo EC, Onoshakpokaiye OE. Relationship between Academic Self-Concept and Academic Performance in Mathematics of Secondary School Students in Delta State, Nigeria. indonesian.j.of.mathematics.education [Internet]. 2023 Nov. 5 [cited 2024 May 18];6(2):63-71. Available from: https://journal.untidar.ac.id/index.php/ijome/article/view/991