Pham, Huong Thi Thu, et al. “LOCAL MARKETING IN TOURISM DEVELOPMENT: CASE STYDY IN PHU THO PRONVINCE, VIETNAM”. The Journal of Contemporary Issues in Business and Government, vol. 27, no. 6, Dec. 2021, pp. 403-19, http://www.cibgp.com/index.php/1323-6903/article/view/2192.