Yuenyong, Chokchai, Sunan Sung-ong, and Teerasak Veerapaspong. 2005. “Thai and New Zealand Students’ Concepts of the Definition of Energy and the Law of Energy Conservation”. Kasetsart Journal of Social Sciences 26 (1):42-51. https://so04.tci-thaijo.org/index.php/kjss/article/view/246241.