Johannis, A. J. E. R. “Nutrition Education Using EBook As an Alternative to Severely Wasted Prevention in Underprivileged Families During the COVID-19 Pandemic at the Bambanglipuro Health Center”. BKM Public Health and Community Medicine, Oct. 2021, https://dev.journal.ugm.ac.id/v3/BKM/article/view/3021.