Difa Aditya Nugraha, Miftakhul Jannah, and Emmanuel Etim Uye. 2025. “The Relationship Between Emotional Regulation and Optimism in Student Athletes”. Indonesian Journal of Sports and Health Psychology 1 (01). Surabaya, ID.:48-55. https://journal.unesa.ac.id/index.php/indojshp/article/view/42954.