Munir, Muhammad. “Kemampuan Pemecahan Masalah Matematika Melalui Pendekatan Open-Ended”. Jurnal Al-Muta`aliyah : Jurnal Pendidikan Guru Madrasah Ibtidaiyah 4, no. 1 (January 15, 2019): 65 - 73. Accessed August 23, 2019. http://ejournal.kopertais4.or.id/sasambo/index.php/mutaaliyah/article/view/3386.