Duong, T. ., and S. . Suppasetseree. “The Effects of an Artificial Intelligence Voice Chatbot on Improving Vietnamese Undergraduate Students’ English Speaking Skills”. International Journal of Learning, Teaching and Educational Research, vol. 23, no. 3, Mar. 2024, pp. 293-21, http://ijlter.net/index.php/ijlter/article/view/1896.