Afendi, Petrus. “Optimism of Characters in Andrea Hirata’s Novel Entitled ‘Orang-Orang Biasa’: An Overview of Literature Psychology”. Indonesian Values and Character Education Journal 4, no. 2 (July 4, 2021): 54–59. Accessed May 8, 2024. https://ejournal.undiksha.ac.id/index.php/IVCEJ/article/view/31792.