Retief!

From Author Wars - https://authorwars.com/publications/retief-296131.html

Overview:

Title: Retief!
Author: Keith Laumer
Year: 2007
ISBN-10: 9780739487402
Publisher: Baen Books / SFBC
Price: $14.99
Pages: 589
Binding: Hardcover
Type: Collection
Title Reference: Retief's War
Notes: SFBC #1232258
Month of publication unknown, but no earlier than January 2007. Date here estimated based on the ISBN and catalog number and on date verification copy was purchased.