Listmania!
The art of looking sideways
The Wooden World: Anatomy of the Georgian NavyThe Wooden World: Anatomy of the Georgian Navy by N.A.M. Rodger
Buy new: £8.49 / Used from: £3.05
Excellent in it's own right, but also says more about leading people in difficult enterprises than most if not all books about "management"
ZEN of GroupsZEN of Groups by Hunter
Buy new: £12.99 / Used from: £7.89
Craftsmanship. All about groups in your coat pocket.
The Fifth Discipline Fieldbook: Strategies for Building a Learning OrganizationThe Fifth Discipline Fieldbook: Strategies for Building a Learning Organization by Peter M. Senge
Buy new: £13.99 / Used from: £7.96
The keys to ascension - and with a shiny red cover.
In Sheep's Clothing: Understanding and Dealing with Manipulative PeopleIn Sheep's Clothing: Understanding and Dealing with Manipulative People by George K Simon
Buy new: £10.39 / Used from: £9.88
Not everybody plays nice. What to do when they don't.
Type Talk at Work: How the 16 Personality Types Determine Your Success on the JobType Talk at Work: How the 16 Personality Types Determine Your Success on the Job by Otto Kroeger
Buy used from: £0.33
Practical reasons to understand and encourage diversity.
Dialogue and the Art of Thinking Together: A Pioneering Approach to Communicating in Business and in LifeDialogue and the Art of Thinking Together: A Pioneering Approach to Communicating in Business and in Life by William Isaacs
Buy new: £23.95 / Used from: £14.62
This one is actually specious, longwinded and pretentious twaddle masquerading as insight. Provides contrast to others in the list.