British Deaf and Dumb Association. (1960). The Language of the silent world. British Deaf and Dumb Association.
Chicago-referens (17:e uppl.)British Deaf and Dumb Association. The Language of the Silent World. [Reading]: British Deaf and Dumb Association, 1960.
MLA-referens (8:e uppl.)British Deaf and Dumb Association. The Language of the Silent World. British Deaf and Dumb Association, 1960.
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