Principles of Legal Research provides comprehensive yet concise coverage of resources and research methods suitable for all researchers. It explains the latest features of the major legal research platforms as well as hundreds of other free and subscription online resources. An introductory survey of research strategies is followed by discussion of major secondary source types, thorough treatment of the sources of U.S. law created by each branch of government, chapters on specialized resources for practitioners, and an overview of international and foreign law. This wholly revised edition adds coverage of artificial intelligence and its use in legal research, and other features include summary introductions to the book's parts, a reorganized case research chapter, and an expanded section on American Indian law. Legal citation tips and instructive illustrations are included throughout, and an appendix lists multivolume treatises by topic.