J C van Dijk & Paul Williams 
Expert Systems in Auditing [PDF ebook] 

This book provides an understanding of the concepts and objectives of expert systems. It is a practical guide, intended to help the practitioner in identifying potential application in his/her own practice, and to understand the limitations of the technology. This should provide the auditor with a ground basis to direct, stimulate and control development efforts in his own practice. At the same time, it should give students in auditing a good grasp of the possibilities and limitations of the technology.