Z. A. Mulya, I. K. Kurnia Putri, and S. Chadjijah, “Kesulitan belajar dalam bingkai teori Piaget pada siswa SMP usia 13–15 tahun: Systematic literature review: Learning difficulties within the framework of Piaget’s theory among junior high school students aged 13–15 years: A systematic literature review”, Kharismatik, vol. 3, no. 2, pp. 112–124, Oct. 2025.