First Published in 1999. Routledge is an imprint of Taylor & Francis, an informa company.

The Nature of Intelligence 2014, Routledge, London

ISBN-13: 9781138882553

Paperback

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The Nature of Intelligence 1999, Routledge

ISBN-13: 9780415210690

Hardcover

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The Nature of Intelligence 1973, Praeger, Westport, CT

ISBN-13: 9780837167619

Revised edition

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