The Bluebook – A Uniform System Of Citation: 21st Edition Spiral is a comprehensive textbook authored by the Columbia Law Review, published by the Harvard Law Review Association. This 21st edition features a spiral format, making it convenient for use in various educational levels, from advanced to beginner, in both law and education subjects. With a publication year of 2020, this textbook provides a uniform system of citation for students and professionals in the legal field, offering essential information in English and Middle language. This textbook is a valuable resource for those seeking to deepen their understanding of law and education in a clear and organized manner.