Puspita Mardika Sari. “Whatsapp Based Education in Pandemic COVID-19 Situation: Evaluating Video and handbook’s Effect on Knowledge of Village Community Health-Volunteers”. BKM Public Health and Community Medicine 37, no. 11 Suppl. (November 3, 2021). Accessed May 4, 2024. https://journal.ugm.ac.id/v3/BKM/article/view/3291.