“PENGARUH MODEL PROBLEM BASED LEARNING TERHADAP HIGHER ORDER THINGKING SKILLS (HOTS) MATEMATIS SISWA”. Buana Matematika : Jurnal Ilmiah Matematika Dan Pendidikan Matematika, vol. 8, no. 2, Dec. 2018, pp. 101-8, https://doi.org/10.36456/buanamatematika.v8i2:.1750.