Putra, H. D., Putri, W. A. S., Fitriana, U., & Andayani, F. (2018). Kemampuan Pemecahan Masalah Matematis dan Self-Confidence Siswa SMP. SJME (Supremum Journal of Mathematics Education), 2(2), 60–70. https://doi.org/10.35706/sjme.v2i2.1313