Watanapokakul, Satita. “The effects of learning prefixes and roots to improve the ability to derive the meaning of unfamiliar words”. LEARN Journal: Language Education and Acquisition Research Network 3 (December 20, 2012): 96–109. accessed September 17, 2026. https://so04.tci-thaijo.org/index.php/LEARN/article/view/102777.