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Kerry, Trevor (1981) Talking: the teacher's role. In: Communicating in the classroom. Hodder and Stoughton, London, pp. 58-69. ISBN 0340266597

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Vanrensburg, I. B. J. and Reyers, Fred and Liebmann, V. A. and Howell, P. and Pletcher, J. M. (1981) Panel discussion: Parvovirus infection in dogs. Journal of the South African Veterinary Association, 52 (1). p. 76. ISSN 1019-9128, 0038-2809