For parallel citations, check Shepard's or KeyCite. Legal dictionaries to define research terms. Legal encyclopedia, hornbooks, ALR, journal articles for background on the issue and citations to the important primary authorities.
Pocket part updates.
Federal Register updates. If there is a statute on point, you need to read it and understand it. Current law by topics in Codes. Check index for citation to title and section of law. Check Popular Name Table if you know the name of the law.