F. N. Sani, F. Rayasari, D. Anggraini, R. N. Agung, and R. D. Wahyuningsih, “The Effect of Progressive Muscle Relaxation on Blood Sugar Levels in Patients with Type 2 Diabetes Mellitus”, IJGHR, vol. 7, no. 5, pp. 913-920, Aug. 2025.