1. Butler, Y. (2004). What level of English proficiency do elementary school teachers need to attain to teach EFL? Case studies from Korea, Taiwan, and Japan.TESOL Quarterly, 38(2), 245–278.
2. Chang, Y. F. (2002). A survey of primary school English education in Miaoli County.English Teaching & Learning, 26(4), 17–37.
3. Chang, Y. F. (2004). A study on English textbook selection for elementary schools.Curriculum & Instruction Quarterly, 7(3), 107–128.
4. Chang, W. C. (2007). On English education of pre-school and post-school.Secondary Education, 58(4), 190–215.
5. Chen, C. L. (1998). Selection of English teaching materials for elementary students.Selected papers from The 15 th Conference on English Teaching and Learning, pp. 223–242. Taipei: Crane Publishing Co., Ltd.