Fitri, N., Warni, H. and Sari, N.Y. 2022. Progressive Muscle Relaxation Therapy Against Anxiety in High School Students Related to the Covid-19 Pandemic . Jurnal Keperawatan. 14, S1 (Mar. 2022), 267–274. DOI:https://doi.org/10.32583/keperawatan.v14iS1.153.