Trà Huyền Trang. (2014). An Investigation into Difficulties in English Pronunciation of the First year Students of English Department at the College of Foreign Language, University of Danang. DHNN.

Trà Huyền Trang. An Investigation Into Difficulties in English Pronunciation of the First Year Students of English Department At the College of Foreign Language, University of Danang. DHNN, 2014.

Trà Huyền Trang. An Investigation Into Difficulties in English Pronunciation of the First Year Students of English Department At the College of Foreign Language, University of Danang. DHNN, 2014.