1. Lagati, S. (1995) “Deaf-blind” or “deafblind”? International perspectives on terminology. Journal of Visual Impairment & Blindness, 89, 306.
2. Maehigashi, T. & Takahashi, W. (1973) Initial leaning of verbal behavior in a child with deafblindness. The 11th Conference of the Japanese Association of Special Education, 52–53. (in Japanese)
3. Ministry of Education, Culture, Sports, Science and Technology (2003) A guide to braille learning instruction (2003 revised edition). (in Japanese)
4. Ministry of Education, Science and Culture (1968) Sensation and learning of blind children. (in Japanese)
5. Ministry of Education, Science and Culture (1970) A guide to education for severe multiple disabilities: Children who are deafblind, children who are blind with intellectual disability and children who are deaf with intellectual disability. Toyokan Publishing, Tokyo. (in Japanese)