Teng, Feng. “Incidental Vocabulary Learning by Assessing Frequency of Word Occurrence in a Graded Reader: Love or Money”. LEARN Journal: Language Education and Acquisition Research Network 7, no. 2 (December 1, 2014): 36–50. accessed October 8, 2026. https://so04.tci-thaijo.org/index.php/LEARN/article/view/102698.