Huynh, Tu, and Li Ly Hoang. “The Effects of Electronic Word of Mouth (eWOM), Persuasion Knowledge and Celebrity Endorsement in Advertisements Upon the Purchase Intention of Foreign Language Learners”. Science & Technology Development Journal: Economics- Law & Management 6, no. 4 (January 31, 2023): 3491-3503. Accessed April 25, 2024. http://stdjelm.scienceandtechnology.com.vn/index.php/stdjelm/article/view/1142.