Quy, Nguyen Tran. “Acoustic Properties of Vietnamese Initial Consonants”. VNUHCM Journal of Social Sciences and Humanities 1, no. 4 (December 27, 2018): 67-76. Accessed April 3, 2025. http://stdjssh.scienceandtechnology.com.vn/index.php/stdjssh/article/view/465.