Febriana, Tantri, and Endang Indarini. “Komparasi Pembelajaran Problem Based Learning (PBL) Dan Problem Solving Terhadap Kemampuan Berpikir Kritis Matematis Siswa Sekolah Dasar”. Jurnal Basicedu, vol. 4, no. 4, Aug. 2020, pp. 1016-20, doi:10.31004/basicedu.v4i4.494.