Ulfah, T. M., and H. Hazim. “Overview of the Prosocial Behavior of Volunteers of the East Java Muhammadiyah Disasster Management Center (MDMC) for Victims of the Semeru Eruption: Gambaran Perilaku Prososial Relawan Muhammadiyah Disasster Management Centre (MDMC) Jawa Timur Bagi Korban Erupsi Semeru”. Journal of Islamic and Muhammadiyah Studies, vol. 5, Aug. 2023, p. 10.21070/jims.v5i0.1573, doi:10.21070/jims.v5i0.1573.