Enderby, P. M. (1987). Assistive communication aids, for the speech impaired. Churchill Livingstone.
Lua i Stíl Chicago (17ú heag.)Enderby, Pamela Mary. Assistive Communication Aids, for the Speech Impaired. Edinburgh: Churchill Livingstone, 1987.
Lua MLA (9ú heag.)Enderby, Pamela Mary. Assistive Communication Aids, for the Speech Impaired. Churchill Livingstone, 1987.
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