Looking for the ultimate self-improvement guide so that you can take matters into your own hands and jump start or rejuvenate your career? Look no further than The Self-Improvement Book: A Guide Book for Success and Personal Development. The Self-Improvement Book is actually a set of four already popular books by renowned business and entrepreneurship authors Can Akdeniz and Jonas Stark. The set includes: The Nine Routines of Successful People: A Guidebook for Personal Change, Problem Solver: An Amazing Way to Deal with Problems and Personal Challenges, Surpass the Average: Learn the Seven Traits of High Achievers, and Productivity Masterclass: Learning to Work Smarter and Faster.