Le QH. The effect of marketing mix 4cs on the domestic tourist’s purchase decision - case study in Vietnam: Part 1_a literature review. Int. J. of Health Sci. [Internet]. 2022 Jun. 23 [cited 2026 Jun. 3];6(S5):4373-8. Available from: https://sciencescholar.us/journal/index.php/ijhs/article/view/9561