KURNIAWAN W. RELATIONSHIP BETWEEN THINK POSITIVE TOWARDS THE OPTIMISM OF PSYCHOLOGY STUDENT LEARNING IN ISLAMIC UNIVERSITY OF RIAU. Nathiqiyyah [Internet]. 2019 Jun. 2 [cited 2026 Feb. 7];2(1). Available from: https://ojs.diniyah.ac.id/index.php/Nathiqiyyah/article/view/54