Gultom, Agustina Boru, and Arbani Batubara. “The Effect of Self-Efficacy and Self-Management Training on Efficacy and Stress in Diabetes Mellitus Patients”. MEDISAINS: Jurnal Ilmiah Ilmu-Ilmu Kesehatan 20, no. 3 (December 31, 2022): 72–76. Accessed July 7, 2026. http://jurnalnasional.ump.ac.id/index.php/medisains/article/view/15386.