Nasution, Zulkarnain, Ganda Sigalingging, Magdalena Ginting, and Angelin Gulo. 2023. “Hubungan Pengetahuan Lansia Dengan Status Vaksinasi Covid-19”. Health Information : Jurnal Penelitian 15 (1):e969. https://myjurnal.poltekkes-kdi.ac.id/index.php/hijp/article/view/969.