Dwayne K. Dowell & Bill Jelen 
Excel for Auditors [PDF ebook] 

Providing the tools and techniques necessary for finding errors and fraud in audits, this guide for auditors looking to better validate their Microsoft Excel spreadsheets provides techniques for performing a risk assessment and gathering spreadsheet and other data from company systems. Performing audit data analysis using data and analytical management functions and pinpointing the common errors in spreadsheets with focused Excel tests is discussed, as are the best practices for error and fraud prevention when developing spreadsheets. This reference is fully updated to reflect Excel 12.