Nonsiri, Petchsri, and Chairat Choesawan. 2020. “The Potential of Health Tourism Resources in the Lower Northern Provincial Cluster 1 (Tak, Sukhothai, Phitsanulok, Uttaradit, Phetchabun)”. JOURNAL OF SOUTHERN TECHNOLOGY 13 (1):1-15. https://so04.tci-thaijo.org/index.php/journal_sct/article/view/216193.