W. Ross Ashby (1956) An Introduction to Cybernetics, (Chapman & Hall, London): This classical book is now available online for free from the Principia Cybernetica Electronic Library [Acrobat PDF-Format]. Nicos Logothetis (Editor, 2001 - ...) MPI Series in Biological Cybernetics Logos Verlag Berlin [Printed] David MacKay (2001) Textbook: Information Theory, Inference and Learning Algorithms [Acrobat PDF-Format] Holk Cruse (2006) Neural Networks as Cybernetic Systems (2nd and revised edition) Now available online at Brains, Minds & Media [Acrobat PDF-Format]