Impact of English Proficiency on National Prosperity: Comparative Study on the Outer Circle and the Expanding Circle Shigeru Ozaki South Asian Research Journal of Arts, Language and Literature, 5(01) 11 - 19, 2023年02月18日, 研究論文(学術雑誌)
The Impact of English on the Economic Development of the Philippines Shigeru Ozaki South Asian Research Journal of Arts, Language and Literature, 4(1) 20 - 25, 2022年02月03日, 研究論文(学術雑誌)
Filipino Teachers of English and Native English Teachers: Learners’ Perceptions Shigeru Ozaki International Journal of Second and Foreign Language Education, 1(1) 10 - 16, 2021年11月20日, 研究論文(学術雑誌)