O'Connor, N., & Hermelin, B. (1963). Speech and thought in severe subnormality; an experimental study. Macmillan.
Chicago-viite (17. p.)O'Connor, N., ja Beate Hermelin. Speech and Thought in Severe Subnormality; an Experimental Study. New York: Macmillan, 1963.
MLA-viite (9. p.)O'Connor, N., ja Beate Hermelin. Speech and Thought in Severe Subnormality; an Experimental Study. Macmillan, 1963.
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