Mindset - Dr. Carol Dweck
The Obstacle Is The Way - Ryan Holiday
Thanks! How Practicing Gratitude Can Make You Happier - Robert A. Emmons
Meditations - Marcus Aurelius
The Myths of Happiness - Sonja Lyubomirsky
The Rise of Superman - Steven Kotler
Motivation and Personality - Abraham Maslow
Creativity: The Psychology of Discovery and Invention - Mihaly Csikszentmihalyi 
Flow: The Psychology of Optimal Experience - Mihaly Csikszentmihalyi
Steal Like an Artist - Austin Kleon 
To Sell is Human - Daniel H. Pink
Instant Influence - Michael V. Pantalon
When: The Scientific Secrets of Perfect Timing - Daniel H. Pink