ARYA EKA SAPUTRA; MUHAMMAD ROMDONY; ABDUL SYAHID. Exploring The Impact Of Textbook On Speaking Proficiency In Business Communication. PESHUM : Jurnal Pendidikan, Sosial dan Humaniora, [S. l.], v. 4, n. 2, p. 1568–1574, 2025. DOI: 10.56799/peshum.v4i2.7407. Disponível em: https://www.ulilalbabinstitute.id/index.php/PESHUM/article/view/7407. Acesso em: 17 apr. 2026.