1) Cases are written opinions issued by appellate courts that can range from a few sentences to hundreds of pages long. Students will read edited case excerpts in textbooks. 2) Lexis and Westlaw are commercial legal research services that law students can use for free. They provide access to cases, statutes, law reviews, and other materials. 3) Statutes are laws passed by legislative bodies that are available in print and online for all U.S. states and federal legislation. A statute progresses from a bill through various published iterations.