Caroline, C. 2022. Knowledge and Attitude Level of Medical Students from Universitas Sumatera Utara about The Importance of COVID-19 Vaccine. JIMKI: Jurnal Ilmiah Mahasiswa Kedokteran Indonesia. 10, 1 (Nov. 2022), 1-10. DOI:https://doi.org/10.53366/jimki.v10i1.509.