T. T. Nguyen, T. N. L. Pham, T. H. Nguyen, D. B. C. Phan, and M. L. Duong, “INFLUENCE OF ENGLISH PROFICIENCY ON KOREAN LANGUAGE LEARNING: A CASE STUDY AT THE FACULTY OF KOREAN LANGUAGE AND CULTURE, VNU UNIVERSITY OF LANGUAGES AND INTERNATIONAL STUDIES”, JFS, vol. 42, no. 3, pp. 151–166, Jun. 2026.