In the Accounting Search Form, you have two options for sources. Your first option is to simply click the check boxes of those sources you'd like to search. Some sources have a Browse option that will let you see the source's Table of Contents. Your other option is to use the check boxes to navigate to the Source Directory. You may select the "Accounting & Tax" option from the "Industry" section or Taxation Law from the Legal section, in the Browse / "Find Sources" form. From there, you can choose multiple sources to search within.