... English and of Hanoi Vietnamese are acknowledged as the reference accents of English and Vietnamese respectively As a result, from the pedagogical aspect, the findings of the research are of highly ... representing accurately the linguistic aspects of Hanoi Vietnamese monophthongs, which serves as a valuable source of reference for cross language comparison The pronunciation of General American English ... http://www.linguistics.ucla.edu/people/grads/billerey/PlotFrog.htm Clark, M J, Hillenbrand, J, et al (1995) Acoustic characteristics of American English vowels Journal of Acoustical Society of America 97(5) Đoàn,...