Dewi, E., N. Q. Nisa, S. D. Nurmahdianingrum, and T. Triyono. “Progressive Muscle Relaxation As an Effort in Reducing Anxiety for Patients With Asthma Attacks”. Jurnal Berita Ilmu Keperawatan, vol. 15, no. 2, July 2022, pp. 185-9, doi:10.23917/bik.v15i2.18185.