Yasrimar, Y. 2017. The use of contextual teaching approach and Learning (ctl) to increase power and squared root in Sd negeri 21 kapuh kecamatan koto xi tarusan. Jurnal Ilmiah Pendidikan Scholastic. 1, 1 (Apr. 2017), 198–208. DOI:https://doi.org/10.36057/jips.v1i1.299.