Diri, Erepamowei Ayibakuro, and Elisha Abel Udo. “Effect of Improvised Instructional Materials on Students’ Academic Achievement in Mathematics in Bayelsa State, Nigeria”. Journal of Research in Education and Pedagogy, vol. 2, no. 1, Feb. 2025, pp. 117-23, https://doi.org/10.70232/jrep.v2i1.34.