Ngo, Vu Minh, Hieu Minh Vu, and Mai Hong Nguyen. “Customer Relationship Management (CRM) Strategies In Small And Medium Enterprises (SMES): A Study In Tourism Industry In Vietnam”. International Journal of Psychosocial Rehabilitation 24, no. 6 (August 31, 2020): 14078–14087. Accessed December 19, 2025. https://www.psychosocial.com/index.php/ijpr/article/view/8307.