Suwankeeree, Pimwalan. 2019. “SUSTAINABLE TOURISM MANAGEMENT OF PHU TOEI NATIONAL PARK, DAN CHANG DISTRICT, SUPHAN BURI PROVINCE”. Phranakhon Rajabhat Research Journal : Humanities and Social Sciences 15 (1):326-41. https://so05.tci-thaijo.org/index.php/PNRU_JHSS/article/view/216294.