Vu Thi Minh Hien, Pham Van Dung, Tran Kim Loan. Assessment of Customers’ Satisfaction with Helicopter Tour Services for Sightseeing at Ha Long Bay. VNU-JEB [Internet]. 2023 Feb. 24 [cited 2024 Dec. 28];3(1). Available from: https://jebvn.ueb.edu.vn/index.php/jeb/article/view/163