Kōichi Hoshina

• Aru kokugo gakusha no kaisō
• Hoshina shinjirin
• Kokkago no mondai ni tsuite
• Kokugogaku shōshi / by Hoshina Kōichi jutsu
• Mohan daizenka gakushūsho
• Nihon kōgohō
• Shin jirin
• Tōkyōgo no seiritsu