Wongarmart, S., and W. Sriraksa. “The Result of Art Learning Management of Sculpture from Natural Materials with Project-Based Learning for Grade 9 Students”. Journal of Innovation and Learning Sciences, vol. 13, no. 1, Mar. 2019, pp. 149-56, https://so02.tci-thaijo.org/index.php/EDGKKUJ/article/view/181157.