Putra, R. P., A. I. Nugroho, A. S. . Rahajeng, and A. F. . Aysila. “Improving High School Adolescents Optimism Through a Best Possible Self Intervention”. Journal of Psychology and Instruction, vol. 8, no. 1, May 2024, https://ejournal.undiksha.ac.id./index.php/JoPaI/article/view/72209.