Não informado. (1963). Mental Retardation. American Association on Mental Deficiency.
Lua i Stíl Chicago (17ú heag.)Não informado. Mental Retardation. Washington: American Association on Mental Deficiency, 1963.
Lua MLA (8ú heag.)Não informado. Mental Retardation. American Association on Mental Deficiency, 1963.
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