Design
Principles
- Universal Principles of Design by William Lidwell, Kritina Holden and Jill Butler. A glossy, well-illustrated encyclopædia of design principles. Rockport Publishers, 2010.
- Learning Design Principles - Introduction to basic principles of axis, symmetry, hierarchy and rhythm
- Design Principles FTW - An index of design principles for all manner of topics
Systems
- Awesome Design Systems - Design systems in action
Implications
Design practice
- On Getting Critique, by Raph Koster
- The Reflective Practitioner: How professionals think in action Donald Schön. Basic Books, 1984.