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