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》. 知识学习与科学技术期刊 ISSN：2959-6386（在线） 3, no. 1 (三月 29, 2024): 106–119. 见于 七月 23, 2026. https://jklst.org/index.php/home/article/view/87.