Simarmata, P. C., H. ., and F. D. Armarin. “Effect Of Progressive Muscle Relaxation And Deep Breathing On Anxiety And Quality Of Life In Patients Covid-19”. JURNAL KEPERAWATAN DAN FISIOTERAPI (JKF), vol. 5, no. 1, Oct. 2022, pp. 167-72, doi:10.35451/jkf.v5i1.1400.