Kokugo Chōsa Iinkai (Japan)

• ... Heike monogatari ni tsukite no kenkyū
• Gimon kanazukai
• Kanji yoran
• Kōgohō
• Kōgotai shokambun ni kansuru chōsa hōkoku
• Kokuji kokugo kairyō ronsetsu nempyō
• Onʻin chōsa hōkokusho
• Shūdai koonkō inchō
• 漢字要覽
• 音韻分布図