Pham Ngoc, Son. “Exploring the Relationship Between Self-Esteem and Optimistic-Pessimistic Attitudes in English Majors at Ho Chi Minh City University of Industry and Trade”. Journal of Knowledge Learning and Science Technology ISSN: 2959-6386 (online) 3, no. 1 (March 29, 2024): 106–119. Accessed September 17, 2025. https://jklst.org/index.php/home/article/view/87.