Choliq, Idham, M. Mundakir, Dede Nasrullah, S. Sukadiono, and Vika Ramadhana Fitriyani. 2022. “Study of Knowledge and Compliance at Muhammadiyah Autonomous Organization (ORTOM) on COVID-19 Prevention”. Gaster 20 (1):54-63. https://doi.org/10.30787/gaster.v20i1.784.