Soeparno, K. ., and B. . Andayani. “Two of the Four Great Thinkers from Yogyakarta: Ki Hadjar Dewantara and Ki Ageng Suryomentram, Humanitarian Fighter and Initiator of Cultured Character Education”. International Conference on Indigenous Psychology and Culture, vol. 1, no. 1, May 2023, pp. 1-11, https://seminar.ustjogja.ac.id/index.php/icipc/article/view/788.