What I read, professionally...
"Drive", Daniel Pink. Intrinsic and extrinsic motivstion. Why rewards are bad!
Anything by Stephen Covey - bit touchy feely but real sense and what he says to do does work.
Anything by Patrick Lencioni
- great for teams, etc.
Anything by Malcolm Gladwell - he has only written four books. Good for thinking outside the box.
Anything by Steven Pinker - really love this "How the brain works" stuff. We are close to a revolution in our understanding of the brain. I wonder if we will be shown to have been quite crude in our current way of educating our children?
Early stuff from Edward de Bono - six thinking hats etc. His later stuff is less good, in my opinion. Wonder why my logo has six colours?
Louise Stoll and anyone she collaborates with. Just makes learning so straightforward. Kate Meyers' books are good as well.
Leadership and Self Deception by The Arbinger Institute. It has a sub title "Getting out of the box".
"Gut Feelings" by Gerd Gigerenzer. How to use your fast judgement self and make better decisions.
"Freakonomics" by Steven D. Levitt and Stephen J. Dubner. (Does it seem I tend to like books written by Stevens!!??)
"Fierce Conversations" by Susan Scott
"The Coaching Manual" by Julie Starr. Just be careful with the advice about taking notes while coaching. In most sessions you do not need to. Your client knows what is happening.
"The Halo Effect", Phil Rosenzweig. Shows up what poor research is.
"Made to Stick", Chip and Dan Heath. Great book. Just read it.