“PENGARUH PROJECT BASED LEARNING TERHADAP KEMAMPUAN BERPIKIR KRITIS MATEMATIS SISWA: THE INFLUENCE OF PROJECT BASED LEARNING ON STUDENTS MATHEMATICAL CRITICAL THINKING ABILITY” (2021) Abacus: Academic Journal of Mathematics Learning and Education, 2(01), pp. 78–93. doi:10.59605/abacus.v2i01.162.