The Bluebook is a widely used citation guide in the legal field, primarily in the United States. It provides a standardized system for citing legal documents, cases, statutes, and other sources, ensuring consistency and clarity in legal writing. The Bluebook is essential for law students, lawyers, and legal scholars when preparing legal documents or academic papers. First published in 1926, the Bluebook is maintained by a group of law students from several prestigious law schools, including Harvard Law School and Yale Law School. It is regularly updated to reflect changes in legal citation practices and to incorporate new legal sources, making it a vital resource for anyone involved in legal research or writing.