บุญคุ้ม พจนา. 2019. “Development of Agro-Tourism Activity Model to Promote the Tourism Market of Sam Phraya Sub-District, Cha Am District, Phetchaburi Province”. Integrated Social Science Journal, Mahidol University 6 (2):396-419. https://so02.tci-thaijo.org/index.php/isshmu/article/view/228947.