Pulukadang, R. J. . “REALISTIC MATHEMATICS LEARNING TO TEACH NEGATIVE NUMBER COUNTING OPERATIONS”. Jurnal Review Pendidikan Dan Pengajaran (JRPP), vol. 6, no. 3, Sept. 2023, pp. 766-74, http://journal.universitaspahlawan.ac.id/index.php/jrpp/article/view/19373.