"The 21 Irrefutable Laws of Leadership" by John C. Maxwell is a timeless leadership guide that has sold over 2 million copies. Maxwell outlines 21 principles for effective leadership, including the Law of the Lid, the Law of Influence, and the Law of Legacy. With real-life examples and anecdotes, Maxwell shows how these laws can be applied to achieve success in various fields. This book is a must-read for anyone looking to develop their leadership skills and become a more effective leader.