Madawistama, S. T., Heryani , Y., & Kurniawan, D. (2022). Three zone learning concepts to improve mathematical proof of probability theory. Jurnal Math Educator Nusantara: Wahana Publikasi Karya Tulis Ilmiah Di Bidang Pendidikan Matematika, 8(1), 27-38. https://doi.org/10.29407/jmen.v8i1.17004