Core Project Management

• "Essential Scrum: A Practical Guide to the Most Popular Agile Process" by Kenneth S. Rubin
• "Effective Project Management: Traditional, Agile, Extreme, Hybrid" by Robert K. Wysocki 
• "Project Management: A Systems Approach to Planning, Scheduling, and Controlling" by Harold Kerzner
• "Project Quality Management: Why, What and How" by Kenneth H. Rose 
• "Identifying and Managing Project Risk: Essential Tools for Failure-Proofing Your Project" by Tom Kendrick
• "Project Manager's Portable Handbook" by David I. Cleland and Lewis R. Ireland (Practical)
• "Project Management for Information, Technology, Business and Certification" by Shyam Kapur

Human Behavior & Philosophy

• "Thinking in Systems: A Primer" by Donella H. Meadows 
• "Models for Critical Thinking: 50+ Models for Problem Solving, Decision Making, and Strategic Thinking" by Gabriel Weinberg and Lauren McCann 
• "Meditations" by Marcus Aurelius 
• "Working with Emotional Intelligence" by Daniel Goleman
• "The Design of Everyday Things" by Donald A. Norman 
• "Neuroscience for Organizational Change: An Evidence-Based Approach" by Hilary Scarlett 
• "Owner's Manual for the Brain: Everyday Applications from Mind-Brain Research" by Pierce J. Howard 
• "The Social Animal" by David Brooks 
• "Finite and Infinite Games" by James P. Carse 

Business & Global Perspective

• "The New World Economy: Information, Knowledge, Networks, and the Future of Capitalism" by Randy Epping 
• "Culture Shock: Surviving and Thriving in Your Changing Workplace" by Don Clifton and Rodd Wagner