Puspita Mardika Sari (2021) “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(11 Suppl.). Available at: https://jurnal.ugm.ac.id/v3/BKM/article/view/3291 (Accessed: 2May2024).