Flow: The Psychology of Optimal Experience http://www.amazon.com/Flow-Psychology-Experience-Mihaly-Csikszentmihalyi/dp/0060920432 http://www.amazon.com/Flow-Psy

Flow: The Psychology of Optimal Experience http://www.amazon.com/Flow-Psychology-Experience-Mihaly-Csikszentmihalyi/dp/0060920432 http://www.amazon.com/Flow-Psychology-Experience-Mihaly-Csik... The Design of Everyday Things http://www.amazon.com/Design-Everyday-Things-Donald-Norman/dp/0385267746 http://www.amazon.com/Design-Everyday-Things-Donald-Norman/d...