Craftsmanship
Clean Code: A Handbook of Agile Software Craftsmanship by Robert Martin
The Clean Coder: A Code of Conduct for Professional Programmers by Robert Martin
The Pragmatic Programmer: From Journeyman to Master by Andy Hunt and Dave Thomas
Software Craftsmanship: Professionalism Pragmatism Pride by Sandro Mancuso
The Coding Dojo Handbook by Emily Bache
Learning
Quickstart Guide to the Five Rules of Accelerated Learning by Willem Larsen and Diana Larsen
Name This Book by Willem Larsen and Diana Larsen
The Clean Coder: A Code of Conduct for Professional Programmers by Robert Martin
The Pragmatic Programmer: From Journeyman to Master by Andy Hunt and Dave Thomas
Software Craftsmanship: Professionalism Pragmatism Pride by Sandro Mancuso
The Coding Dojo Handbook by Emily Bache
Learning
Quickstart Guide to the Five Rules of Accelerated Learning by Willem Larsen and Diana Larsen
Name This Book by Willem Larsen and Diana Larsen
Coding Practices
Test Driven Development: By Example by Kent BeckAgile Principles, Patterns, and Practices in C# by Robert Martin and Micah Martin
Head First Design Patterns by Elisabeth and Eric Freeman with Bert Bates and Kathy Sierra
Working Effectively with Legacy Code by Michael Feathers
Code Complete: A Practical Handbook of Software Construction by Steve McConnell
The Mythical Man-Month: Essays on Software Engineering by Fred Brooks
Rapid Development: Taming Wild Software Schedules by Steve McConnell
Teams
Agile Retrospectives: Making Good Teams Great by Esther Derby and Diana LarsenThe Dream Team Nightmare by Portia Tung
The Retrospective Handbook by Patrick Kua
The Five Dysfunctions of a Team: A Leadership Fable by Patrick Lencioni
Liftoff: Launching Agile Projects & Teams by Diana Larsen and Ainsley Nies
Collaboration Games by Karen Greaves and Samantha Laing
Lean
The Goal: A Process of Ongoing Improvement by Eliyahu M. Goldratt and Jeff CoxThis is Lean: Resolving the Efficiency Paradox by Niklas Modig and Pär Åhlström
Commitment by Olav Maassen, Chris Matts and Chris Geary
Change
The Power of Habit: Why We Do What We Do in Life and Business by Charles Duhigg
Switch: How to Change Things When Change Is Hard by Chip Heath and Dan Heath
Fearless Change: Patterns for Introducing New Ideas by Mary Lynn Manns Ph.D. and Linda Rising Ph.D.
Continuous Delivery
The Phoenix Project: A Novel About IT, DevOps, and Helping Your Business Win by Gene Kim, Kevin Behr and George SpaffordContinuous Delivery: Reliable Software Releases through Build, Test, and Deployment Automation by Jez Humble and David Farley
C#
C# in Depth, Second Edition by Jon SkeetTesting
Quality Code: Software Testing Principles, Practices, and Patterns by Stephen VanceAgile Testing: A Practical Guide for Testers and Agile Teams by Lisa Crispin and Janet Gregory
Pragmatic Unit Testing in C# with NUnit, 2nd Edition by Andy Hunt and Dave Thomas with Matt Hargett (there is also a Java specific version but the concepts are fairly language independent)
Leadership
How Will You Measure Your Life? by Clayton M. ChristensenJoy, Inc.: How We Built a Workplace People Love by Richard Sheridan
The Advantage: Why Organizational Health Trumps Everything Else In Business by Patrick M. Lencioni
Multipliers: How the Best Leaders Make Everyone Smarter by Liz Wiseman with Greg McKeown
Drive: The Surprising Truth About What Motivates Us by Daniel Pink
To Sell Is Human: The Surprising Truth About Moving Others by Daniel Pink
Crucial Conversations Tools for Talking When Stakes Are High, Second Edition by Patterson, Grenny, McMillan, Switzler
Leadership and Self-Deception: Getting out of the Box by Arbinger Institute
StrengthsFinder 2.0 by Tom Rath
Strengths Based Leadership: Great Leaders, Teams, and Why People Follow by Tom Rath and Barry Conchie
Good to Great: Why Some Companies Make the Leap... and Others Don't by Jim Collins
The Innovator's Dilemma: When New Technologies Cause Great Firms to Fail by Clayton M. Christensen