VAN PHUC, Nguyen.
 Contribution of Singing Subject to the Effectiveness of Foreign Language Trainning Program at Vietnam National University Hanoi.
<strong>VNU Journal of Science: Education Research</strong>, [S.l.], v. 38, n. 2, may 2022.
ISSN 2588-1159.
Available at: &lt;<a href="https://js.vnu.edu.vn/ER/article/view/4655" target="_new">https://js.vnu.edu.vn/ER/article/view/4655</a>&gt;. Date accessed: 23 dec. 2024.
doi: <a href="https://doi.org/10.25073/2588-1159/vnuer.4655">https://doi.org/10.25073/2588-1159/vnuer.4655</a>.