“The Bluebook: A Uniform System of Citation, Twenty First Edition” is a textbook authored by the Columbia Law Review and published by the Harvard Law Review Association. This trade paperback book, published in 2020 in the United States, serves as a comprehensive guide in the field of law education. With a focus on legal citation, this textbook provides a detailed and standardized system for referencing legal materials and case law. It is a valuable resource for students and professionals in the legal field, offering essential information and guidance in English language.