Afriyenti, A. “Process Improvement Through Learning About Build Size Model Cooperative Stad And Quiz In Class Vi Sdn 33 Desert Long District Of Koto Xi Tarusan In Subjects Mathematics Academic Year 2016/2017”. Jurnal Ilmiah Pendidikan Scholastic, vol. 1, no. 2, Oct. 2018, pp. 43-51, doi:10.36057/jips.v1i2.246.