Phuong, Nguyen Nam, and Tran Thi Mai Phuong; Ths. “Factors under the Influence of the Elderly Tourists’ Motive in Vietnam: Study in Hanoi”. The International Journal of Humanities & Social Studies 7, no. 3 (March 31, 2019). Accessed May 10, 2024. http://www.internationaljournalcorner.com/index.php/theijhss/article/view/143862.