Adams, Douglas - [Dirk Gently 1] - The long dark tea-time of the soul (1991, New York _ Pocket Books, 1990, c1988., 9780671742515)

Adams, Douglas - Dirk Gently's Holistic Detective Agency (1987, Simon & Schuster)

Adams, Douglas - The Salmon of Doubt (2003, Ballantine Books)

Douglas, Adams - The Ultimate Hitchhiker's Guide to the Galaxy (2010, Random House Publishing Group, 978-0-307-49846-5)