A few unusual but worthy books you might want to check out:
Day of Empire: How Hyperpowers Rise to Global Dominance - and Why They Fall by Amy Chua. A fascinating overview of how various empires rose due to their tolerance, then fell prey to a lack of tolerance which in turn triggered a backlash and a decline.
The Praetorians by Jean Larteguy. This insightful novel about French paratroopers in the Algerian war may be hard to find, but it's worth your time.
One Man's America: The Pleasures and Provocations of Our Singular Nation by George F. Will. You may not embrace all of his opinions - I often think George F. Will needs to be critiqued by George F. Will - but when he is clicking there is no one who can touch him.
Hitler & Churchill: Secrets of Leadership by Andrew Roberts. Open this book at any page and you'll find something of interest. Well-written and yes, it can be applied to the workplace.