Dwi Fitra Arreski, and Fadhilah Ahmad Qaniah. “Literacy Level and Happiness Score Across Countries: A Secondary Data Correlation Study”. PSYCHONESIA: JOURNAL OF PSYCHOLOGY 1, no. 1 (August 19, 2025): 14–22. Accessed September 18, 2025. http://ejurnal.fip.ung.ac.id/index.php/pjp/article/view/1.