ยิ้มแก้ว ร., and กุลตวนิช ก. “Three-Dimensional Virtual Field Trips for Lowland a Khok Nong Na Model”. Journal of Rattana Bundit University, vol. 14, no. 1, June 2019, pp. 68-81, https://so03.tci-thaijo.org/index.php/rbac/article/view/224531.