Babatunde Adeniyi ADEYEMI and Grace Olajumoke JUBRIL 2019. Influence of teachers’ professionalism, class size and instructional materials on lower primary school pupils’ performance in social studies in Osun State Nigeria. The African Journal of Behavioural and Scale Development Research. 1, 2 (Aug. 2019). DOI:https://doi.org/10.58579/ajbsdr.v1i2.27.