Longjamnong, N., and P. Worakham. “Project-Based Learning Management on Geometrical Optics for Encouraging Problem Solving Ability and Scientific Attitudes of 11th Grade Students: -”. Ratchaphruek Journal, vol. 19, no. 3, Dec. 2021, pp. 32-41, https://so05.tci-thaijo.org/index.php/Ratchaphruekjournal/article/view/251490.