K. . Soeparno 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”, Intl. Conf. on Indigenous Psy. n Cult, vol. 1, no. 1, pp. 1–11, May 2023.