Handayaningrum, A. B. ., and T. F. Fadilah. “Relationship Between Closed Contact and Pediatric COVID-19 in Panjatan II Health Center Kulon Progo”. Jurnal Biomedika Dan Kesehatan, vol. 5, no. 3, Dec. 2022, pp. 161-70, doi:10.18051/JBiomedKes.2022.v5.161-170.