APA (7th ed.) Citation

O'Connor, N., & Hermelin, B. (1963). Speech and thought in severe subnormality; an experimental study. Macmillan.

Chicago Style (17th ed.) Citation

O'Connor, N., and Beate Hermelin. Speech and Thought in Severe Subnormality; an Experimental Study. New York: Macmillan, 1963.

MLA (9th ed.) Citation

O'Connor, N., and Beate Hermelin. Speech and Thought in Severe Subnormality; an Experimental Study. Macmillan, 1963.