S. Pham Ngoc, “Exploring the Relationship between Self-esteem and Optimistic-Pessimistic Attitudes in English Majors at Ho Chi Minh City University of Industry and Trade”, J. Knowl. Learn. Sci. Technol., vol. 3, no. 1, pp. 106–119, Mar. 2024, doi: 10.60087/jklst.vol3.n1.p119.