Mandaty, F., A. Syaifudin, and S. Sumarno. “The Relationship Between Progressive Muscle Relaxation Therapy and Blood Pressure in Elderly People Suffering from Hypertension”. Jurnal Persada Husada Indonesia, Vol. 11, no. 42, July 2024, pp. 9-15, doi:10.56014/jphi.v11i42.399.