The Bluebook: A Uniform System of Citation, 20th Edition is a comprehensive and authoritative guide for legal professionals and students. Published in 2016 by the Harvard Law Review Association in spiral format, this book provides a detailed system of citation for legal documents and references. Authored by the Columbia Law Review, it is a must-have resource for anyone working in the field of law. With a weight of 27.3 oz, this edition is a valuable and practical tool for legal research and writing.