KURNIAWAN, WILLYTIYO. “RELATIONSHIP BETWEEN THINK POSITIVE TOWARDS THE OPTIMISM OF PSYCHOLOGY STUDENT LEARNING IN ISLAMIC UNIVERSITY OF RIAU”. Nathiqiyyah 2, no. 1 (June 2, 2019). Accessed January 23, 2025. https://ojs.diniyah.ac.id/index.php/Nathiqiyyah/article/view/54.