1. Assistive Technology Sourcebook;Enders,1990
2. Computers and the Americans with Disabilities Act: A Manager’s Guide;McCormick,1994
3. Trace Resourcebook;Bower,1998
4. Communication devices for the non-vocal disabled;Thomas;Computer,1981
5. A comparison of mouth stick and Morse code text inputs;Levine;AAC Augmentative and Alternative Communication,1996