Y. Yerizon, Y. Ahda, and D. Amsari, “The influence of contextual approach to students’ problem solving ability of Class IX of SMP Negeri 1 Bayang”, EJSMT, vol. 6, no. 2, pp. 1–8, Dec. 2019, doi: 10.37134/ejsmt.vol6.2.1.2019.