Daengsi, T., and P. Pornpongtechavanich. “Naturalness of Synthesized Speech: A Subjective-Comparative Study Utilizing ACR Listening-Opinion Tests between Siri and Google Translate Using News Content”. Burapha Science Journal, vol. 27, no. 1 January-April, Mar. 2026, pp. 361-77, https://li05.tci-thaijo.org/index.php/buuscij/article/view/1338.