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Arya Eka Saputra, Muhammad Romdony, Abdul Syahid. Exploring The Impact Of Textbook On Speaking Proficiency In Business Communication. PESHUM [Internet]. 2025 Jan. 9 [cited 2026 Aug. 7];4(2):1568-74. Available from: https://al-haramjournal.co.id/PESHUM/article/view/7407