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Bernstein, B. (1973). A brief account of the development of codes. In Lee, V Social Relationships and Language (Milton Keynes : Open University.)

Tough, J. (1977). Talking and Learning (London . Ward Lock Educational)

Tough, J. (1979). Talk for Teaching and Learning ( London: Ward Lock Educational).

Tough, J. (1981). A Place for Talk (London. Ward Lock Educational)