Developing your skills for public speaking. (n.d.). Tankobon.
Kamada, O., & Sugimoto, F. (2012a). Ikita sozai de manabu shin chūkyū kara jōkyū e no Nihongo (Shohan = 1st edition). Japan Times.
Kamada, O., & Sugimoto, F. (2012b). Ikita sozai de manabu shin chūkyū kara jōkyū e no Nihongo (Shohan = 1st edition). Japan Times.
Miyahara, A. (2006). Ryuugakusei no tame no Jidai o yomitoku Nihongo. 3A Corporation.
Shimizu, M., & Okuyama, T. (2015). Nihongo gakushūsha no tameno dokkai gensen tēma 10: Chūjōkyū. Bonjinsha.
Tomomatsu, E. (2008). Shouronbun e no 12 no steppu. 3A Corporation.