Dirk Gently's Holistic Detective Agency

From Author Wars - https://authorwars.com/publications/dirk-gentlys-holistic-detective-agency-358835.html

Overview:

Title: Dirk Gently's Holistic Detective Agency
Author: Douglas Adams
Year: Unknown
ISBN-10: 0330301624
Publisher: Pan Books
Price: £3.99
Pages: 247
Binding: Paperback
Type: Novel
Title Reference: Dirk Gently's Holistic Detective Agency
Notes: Stated 5th printing by numberline of the 1988 Pan Books Ltd edition.
Artist credited on back cover