Aquan, Hendra Michael, Diana Handoyo, and Paulus Wiryono Priyotamtama. 2022. “IDENTIFICATION OF THE FACTORS AFFECTING UNIVERSITY STUDENTS OPTIMISM DURING THE COVID-19 PANDEMIC”. Lingua: Jurnal Ilmiah 18 (2):76-99. https://jurnal.universitaslia.ac.id/index.php/lingua/article/view/53.