[1]
Sianturi, A., Sipayung, T.N. and Simorangkir, F.M.A. 2018. Pengaruh Model Problem Based Learning (PBL) Terhadap Kemampuan Berpikir Kritis Matematis Siswa SMPN 5 Sumbul. Union : Jurnal Ilmiah Pendidikan Matematika. 6, 1 (Feb. 2018). DOI:https://doi.org/10.30738/.v6i1.2082.