Chi, Nguyen, 		Van, Nguyen, 		Tram, Nguyen, 		Nga, Tran, AND 		Thanh, Ngo.
" Effectiveness of Formal Professional Development Activities in Vietnam: What Affects English-as-Foreign-Language Lecturers’ Perceptions" <em>VNU Journal of Science: Education Research</em> [Online], Volume 39 Number 4 (2 November 2023)