Nguyen Thi Hoa, , P. V. T. D. T. N. H. N. D. T. “MARKETING STRATEGIES FOR TOURISM AND DIGITAL TECH APPLICATIONS IN TOURISM INDUSTRY - A CASE OF OCH TOURISM CORPORATION IN VIETNAM ”. Design Engineering, Sept. 2021, pp. 13938-50, http://thedesignengineering.com/index.php/DE/article/view/4657.