Ngussa, Baraka Manjale, and Elias Elisha Mbuti. 2017. “The Influence of Humour on Learners’ Attitude and Mathematics Achievement: A Case of Secondary Schools in Arusha City, Tanzania”. IJRDO- Journal of Educational Research 2 (3), 170-81. https://doi.org/10.53555/er.v2i3.165.