1. Hoang, V.V. (2008). Factors influencing the quality of non-major English education at Hanoi National University. Journal of Science, Vietnam National University, Foreign Languages, 24, 22–37. http://dx.doi.org/10.46827/ejel.v8i5.5013
2. Wiseman, S. (Ed.). (1961). Examinations and English education. Manchester: Manchester University Press.
3. Hoang, V.V. (2010). Teaching non-major English at universities in Vietnam - Practice and theory. National University Publishing House, Hanoi.
4. Huynh, T.L.H. (2017). Self-learning strategies and factors influencing the choice of self-learning strategies among B1-level English students at Hue University's College of Foreign Languages. Scientific Announcement, College of Foreign Languages, Hue University. Hue. Vietnam.
5. Nguyen, T.N. (2008). Decision approving the Project "Teaching and learning foreign languages in the national education system from 2008 to 2020". Retrieved from http://www.chinhphu.vn/portal/page/portal/chinhphu/hethongvanban?class_id=1&_page=18&mode=detail&document_id=78437