HALIMAH, A. N.; BUDIANTO, A.; HOESNY, M. U.; CABUQUIN, J. C.; ULFA, S. Improving English Speaking Skills Through AI-Based Voice Chatbots: A Systematic Review of Vocational Education Studies. Studies in Learning and Teaching, v. 6, n. 3, p. 785-797, 1 Jan. 2026.