"The Seven Principles for Making Marriage Work" by Gottman. It's not the best writing in the world yet it's based on 50 years of actual research.

"Peopleware" by Tom DeMarco. It's a book every manager should read about how, maybe, you can create a team that jells.

"The Effective Executive" by Peter Drucker. Examines the necessities of knowledge work. What every manager and employee should read.