Braille Authority of North America. (1987). Code for computer braille notation.Louisville, KY: American Printing House for the Blind.
2.
Braille Authority of North America. (1997). Braille formats: Principles of print to braille transcription.Louisville, KY: American Printing House for the Blind.
3.
DixonJ., & GrayC. (1998). Computer braille code made easy.Boston: National Braille Press.