The following link redirects you to the IRS Publications.
The Church and Nonprofit Tax & Financial Guide published by Zondervan comes out each year and includes the latest tax law changes, expert advice on handling charitable gifts, and key financial policies and procedures. Check online for availability.
The Church Guide to Internal Controls by Richard Vargo (Church Law and Tax Report) is a great resource for understanding internal controls that ensure the integrity of accounting and financial information. Check out this book online.