Gaol, R. L., and J. Naibaho. “An Overview of the Knowledge of Level 1 Nurse Students about the 5M Health Protocol in Covid-19 Prevention at STIKes Santa Elisabeth Medan 2022”. JURNAL KEPERAWATAN DAN FISIOTERAPI (JKF), vol. 5, no. 1, Oct. 2022, pp. 21-26, doi:10.35451/jkf.v5i1.1144.