Zulfetriani, Zulfetriani. “Improving The Student’s Classroom Student’s Reasoning Ability In Mathematics Lesson Through Problem Solving Efforts At Sdn 13 Kubang”. Jurnal Ilmiah Pendidikan Scholastic, vol. 1, no. 2, Oct. 2018, pp. 149-58, doi:10.36057/jips.v1i2.257.