Na Songkhla, R., and N. Na Songkhla. “Guidelines to Create Value-Added for Product and Service of Community-Based Tourism, Study Case for Phatthalung Province”. Journal of Thai Hospitality and Tourism, vol. 17, no. 2, Oct. 2022, pp. 45-55, https://so04.tci-thaijo.org/index.php/tourismtaat/article/view/248483.