Abood MH, Ghbari TA. The Existential Vacuum and Its Relationship to Pessimism and Optimism among Undergraduate Students . Islam G. & C. Jour [Internet]. 2024 Jul. 24 [cited 2026 Mar. 11];7(2). Available from: https://journal.iaimnumetrolampung.ac.id/index.php/igcj/article/view/4875