Phạm Tuấn D. Some strategies to directly reject American invitations. SCIENTIFIC JOURNAL OF TAN TRAO UNIVERSITY, [S. l.], v. 5, n. 12, p. 123–131, 2020. DOI: 10.51453/2354-1431/2019/230. Disponível em: https://tckh.daihoctantrao.edu.vn/index.php/sjttu/article/view/230. Acesso em: 6 may. 2024.