In addition to various great TED talks (e.g. Designers — think big!, A call for "design thinking", How to build your creative confidence) our recommendations are:

• Creative Confidence, Tom & David Kelley
• The Art of Innovation, Tom Kelley and Jonathan Littmann
• The Ten Faces of Innovation, Tom Kelley
• Game storming, a playbook for Innovators, Rulebreakers, and Changemakers, D. Gray, S. Brown, J. Macanufo
• Road Trip to Innovation, Delia Dumitrescu
• Design-Driven Innovation - Changing the Rules of Competition by radically Innovation What Things mean, Richard Verganti
• Human-Centered Design Toolkit, IDEO
• Democratizing Innovation, Eric von Hippel
• What matters now, Gary Hamel
• To Do: Die neue Rolle der Gestaltung in einer veränderten Welt, Florian Pfeffer
• Design Thinking, Innovation lernen - Ideenwelten öffnen, Hasso Plattner, Christoph Meinel, Ulrich Weinberg
• Durch die Decke denken, Jürgen Erbeldinger, Thomas Ramge
• A Whole New Mind - Why Right-Brainers Will Rule The Future, Dan Pink
• Change by Design - How Design Thinking Transforms Organizations and Inspires Innovation, Tim Brown
• The design of Business: Why Design Thinking is the next competitive advantage, Roger Martin
• Rapid Viz, a new method for the rapid visualization of Ideas, Hanks & Belliston
• The back of the napkin, Dan Roam
• Visual Meetings, David Sibbet
• Visual Leaders, David Sibbet