Firdaus, Vera, Hasan Ubaidillah, and Mas Oetardjo. “Kinerja Relawan Sebagai Helping Profession Antara Profesionalisme Dan Motivasi Altruistik”. SPEED Journal : Journal of Special Education 7, no. 1 (July 26, 2023): 47–54. Accessed September 10, 2024. https://jurnal.unipar.ac.id/index.php/speed/article/view/1216.