กังขาว ส., and เลาหะเพ็ญแสง จ. “MASTER PLAN DEVELOPMENT ON CREATIVE TOURISM STRATEGY FOR SPECIALIZED MONUMENTAL AREAS OF HISTORICAL DISTRICTS-SUKHOTHAI, SI SATCHANALAI, AND KAMPHAENGPHET”. Journal of Industrial Education, vol. 16, no. 1, Apr. 2017, pp. 50-57, https://ph01.tci-thaijo.org/index.php/JIE/article/view/123860.