Communication for the speechless an introduction to nonvocal communication systems for the severely communicatively handicapped
| Prif Awdur: | |
|---|---|
| Fformat: | Llyfr |
| Iaith: | English |
| Cyhoeddwyd: |
Englewood Cliffs, N.J.
Prentice-Hall
c1980.
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| Pynciau: |