Penulis: David H. Ringstrom

David H. Ringstrom, CPA, is president of Accounting Advisors, Inc., an Atlanta-based spreadsheet and database consulting firm, and has served as the technical editor for over three dozen books in the For Dummies series. Elaine Marmel is president of Marmel Enterprises, LLC, an organization that specializes in technical writing and software training. She has authored and co-authored over ninety books.