widada, wahyu. “THE EXISTENCE OF STUDENTS IN TRANS EXTENDED COGNITIVE DEVELOPMENT ON LEARNING OF GRAPH THEORY*)”. Jurnal Math Educator Nusantara: Wahana Publikasi Karya Tulis Ilmiah di Bidang Pendidikan Matematika 1, no. 1 (May 25, 2015). Accessed April 22, 2024. https://ojs.unpkediri.ac.id/index.php/matematika/article/view/119.