Não informado. (1967). Deficience mentale. Canadian Association for Retarded Children.
Lua i Stíl Chicago (17ú heag.)Não informado. Deficience Mentale. Toronto, Canada: Canadian Association for Retarded Children, 1967.
Lua MLA (8ú heag.)Não informado. Deficience Mentale. Canadian Association for Retarded Children, 1967.
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