Usui, H. (2011). Ikkai de gokaku nihongo noryoku shiken n1 bunpo taisaku (First edition.). Takahashishoten.
Tohutoru Kātū Chicago (17th ed.)Usui, Hiromi. Ikkai De Gokaku Nihongo Noryoku Shiken N1 Bunpo Taisaku. First edition. Tokyo: Takahashishoten, 2011.
Tohutoro MLA (9th ed.)Usui, Hiromi. Ikkai De Gokaku Nihongo Noryoku Shiken N1 Bunpo Taisaku. First edition. Takahashishoten, 2011.
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