KURNIAWAN, WILLYTIYO. RELATIONSHIP BETWEEN THINK POSITIVE TOWARDS THE OPTIMISM OF PSYCHOLOGY STUDENT LEARNING IN ISLAMIC UNIVERSITY OF RIAU. Nathiqiyyah, [S. l.], v. 2, n. 1, 2019. Disponível em: https://ojs.diniyah.ac.id/index.php/Nathiqiyyah/article/view/54. Acesso em: 7 feb. 2026.