Well try this AMAZON link

http://www.amazon.com/Expert-Systems-Artificial-Intelligence-Books/b?ie=UTF8&node=3890

dear Theodora, i want your suggestion about this matter....

I would suggest the following:

[1] Introduction to Expert Systems, Jackson P. , 3rd edition, Addison Wesley, ISBN 0-201-87686-8

[2] Giarratano J. , Riley G. , Expert Systems, Principles and Programming, PWS Publising Company, Boston., ISBN 0-534-93744-6

But, one of the most advanced ones is the following:

[3] Introduction to Knowledge Systems, Stefik M., Morgan Kaufmann, ISBN 1-55860-166-X

Thanks Nick for that ... well, this one seems ok - but might be a bit expensive - however, there is kindle version - and published by Springer

Recommender Systems Handbook edited by Francesco Ricci, Lior Rokach, Bracha Shapira, and Paul B. Kantor

Hope this helps!

Regards

Theodora Issa

Thanks Dear Nick,

I think the best book for Expert System is still far way the Knowledge Engineering and Management, The Common KADS Methodology, from Guus Schreiber and 5 other colleagues. Although it would require some update to nowaday technology, it is a complete guide for development of real appplications. I have been using it for teaching and developing industrial systems for a decade. Recommender system is just a class of Expert System and the application is quite narrow. Jackson and Stefik are quite theoretical. They are great textubooks for academic introduction (quite historical) view of IA techniques for Expert Systems, but I consider that few of these techniques can leave the prototype level to became real applications.