Reprinted in September 1991 by
John Wiley & Sons Ltd, The Atrium, Southern Gate,
Chichester, West Sussex PO19 8SQ, England
First published in 1987 by Open University Press
Reprinted 1991, 1992, 1994, 1995, 1996, 1997 (twice), 1999, 2000,
2001, 2002, 2003 (three times), 2005, 2006, 2007
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No part of this book may be reproduced by any means,
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without the written permission of the publisher.
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