USMANOV , Farrux. Research on the effectiveness of business English course and factors of success in business communication. The Lingua Spectrum, [S. l.], v. 4, n. 1, p. 111–115, 2025. Disponível em: https://lingvospektr.uz/index.php/lngsp/article/view/277. Acesso em: 12 jun. 2026.