American Jurisprudence 2nd Edition, a staple of law libraries, is an authoritative legal encyclopedia. This is an excellent resource to get background on a broad range of legal topics.
American Jurisprudence is available Nexis Uni, which is helpful in the sense that you don't need to worry about paging through a print edition, but is troublesome in that Nexis Uni is difficult for new users.
The tutorial below walks you through the process of searching American Jurisprudence in Nexis Uni.
