Diri EA, Udo EA. Effect of Improvised Instructional Materials on Students’ Academic Achievement in Mathematics in Bayelsa State, Nigeria. J. Res. Educ. Pedagog. [Internet]. 2025 Feb. 3 [cited 2025 Mar. 9];2(1):117-23. Available from: https://spm-online.com/jrep/index.php/journal/article/view/34