Hi
For Training, both theory & practise, one of best authors (in my humblest opinion) is Leslie Rae. His writing is detailed and simple to follow. If you google his name + books you should get a good list. If you don't let me know, I will dig my collection :)
Another definite read for you is Emotional Intelligence & Working with Emotional Intelligence - both by Daniel Goleman. Don't waste time and money looking at other authors on this subject.
And yes!!!!! please read Edward de Bono's books. They are excellent. eg. for communication skills, you can pick up (and build a session from there) the book "How to have a Beautiful Mind". Jargon free book, if ever there was one.
Also, Transactional Analysis by Thomas Harris M.D. and NLP books by Richard Bandler or John Grinder or Joseph O'connor.
Try The Art of War by Sun Tzu or Arthashastra by Chanakya. Both are excellent books on strategy and leadership. Also books by Charles Handy and Peter Drucker.
This should do for now to give you a few sleepless nights. :? :roll:
Regards
Ryan