Personally I've found there to be few helpful books which directly relate to management consulting / business strategy. The only one that I've found really helpful is:
Winning - an overall look on business strategies and philosophies used by Jack Welch (former CEO of GE)
But here are some books that are very helpful in developing people / soft skills essential to effective consultants:
Getting to Yes - an incredible book on negotating skills.
How to Argue and Win Every Time - not as argumentative as it sounds, this is a great book which is hugely helpful on how to present your positions and how to get the best outcome for everyone in a situation.
Influence - brilliant book on the ways in which we are influenced to do things.
The 48 Laws of Power - a very Machiavellian put pragmatic look on the ways in which personal power is gained / lost.
Vital Lies, Simple Truths - how to recognise self deception that we're all prone to and how to overcome its limitations
The Blank Slate - a mindblowing book on human psychology and what we're naturally predisposed to be. Helps you to better understand people and their motivations in not just business but all aspects of life. Read from Part 2 onwards.
Personally I've found there to be few helpful books which directly relate to management consulting / business strategy. The only one that I've found really helpful is:
But here are some books that are very helpful in developing people / soft skills essential to effective consultants:
http://www.amazon.com/Winning-Jack-Welch/dp/0060753943