Pradit, Rodsukhon, and Ratklao Premprasit. 2019. “Potentials and Opportunities in Tourism Development of KhaoKho Sub-District, Phetchabun Province”. Journal of Social Sciences Naresuan University 10 (2):10_127-149. https://so04.tci-thaijo.org/index.php/jssnu/article/view/211185.