Highly rated books published more than 15 years ago.

Nudge: Improving decisions about health, wealth and happiness Richard Thaler, Cass Sunstein
Bringing User Experience to Healthcare Improvement: The Concepts, Methods and Practices of Experience-based Design Paul Bate, Glenn Robert

Three star rating with growing community support.

The Power of Less: The 6 Essential Productivity Principles That Will Change Your Life Leo Babauta