Dewi, N. L. S., Suweken, G., & Sudiarta, I. G. P. (2019). Development of mathematics learning tools through scientific approach with problem based learning (PBL) settings to improve motivation and learning achievement. Jurnal Pendidikan Dan Pengajaran, 52(1), 33–39. https://doi.org/10.23887/jpp.v52i1.17247