Pawenrusi, E. P., S. Suarni, H. Hardianti, and S. N. Astuti. “The Effect of Progressive Relaxation Techniques on Anxiety Levels in Schizophrenic Patients”. Jurnal Keperawatan, vol. 14, no. 3, Sept. 2022, pp. 679-84, https://journal2.stikeskendal.ac.id/index.php/keperawatan/article/view/434.