How to Win Friends & Influence People
by Dale Carnegie

The Leadership Challenge
by James M. Kouzes, Barry Z. Posner

Freakonomics: A Rogue Economist Explores the Hidden Side of Everything
by Steven D. Levitt, Stephen J. Dubner

Primal Leadership: Learning to Lead with Emotional Intelligence
by Daniel Goleman, Richard E. Boyatzis, Annie McKee

The 7 Habits of Highly Effective People
by Stephen R. Covey

Never Eat Alone: And Other Secrets to Success, One Relationship at a Time
by Keith Ferrazzi, Tahl Raz