Kokuritsu Kokugo Kenkyūjo, Tokyo

• Denshi keisanki ni yoru shimbun no goi chōsa
• Dōshi keiyōshi mondaigo yōrei shū
• Dōshi no imi yōhō no kijutsuteki kenkyū
• Gendai shimbum no kanji chōsa
• Gendaigo no joshi jodōshi
• Shakai kōzō to gengo no kankei ni tsuite no kisoteki kenkyū