Asai, Tomoo, Ryohei Honda, Kiyomi Watanabe, and Toshiaki Ozasa. 2019. “A Correspondence Analysis of Seventeen Japanese Historical Third-Year English-As-a Foreign-Language Textbooks”. International Journal of Learning, Teaching and Educational Research 18 (4):17-48. http://www.ijlter.myres.net/index.php/ijlter/article/view/572.