Lamarca, Ferdinand J., and Chiara Ayn J. Lamarca. 2017. “Social Impacts of Tourism in the Heritage City of Vigan, Philippines and Ayutthaya City, Thailand”. Journal of Politics and Governance 7 (1). Mahasarahham, Thailand:118-33. https://so03.tci-thaijo.org/index.php/jopag/article/view/155120.