Lawyers tirelessly spend several hours gazing upon different legal materials in order to achieve a perfect argument. This process is termed – Legal Research. The legal materials that lawyers examine are named – Legal Sources or Sources of Law. There are many legal sources lawyers utilize within the United States. The most commonly observed sources, but not limited to, include: The United States Constitution, the United States Code (USC), the Code of Federal Regulations (CFR), Executive Orders, and the United States Reports – a printed multi-volume selection of reports containing every single U.S. Supreme Court case and ruling. To get a glimpse of each source, click here.