Richard Koch

Books
The 80/20 Principle, Third Edition The 80/20 Principle, Third Edition
The 80/20 Principle, Third Edition
1998
80/20 Beliefs 80/20 Beliefs
80/20 Beliefs
2026
O Gestor 80/20 O Gestor 80/20
O Gestor 80/20
2025
80/20 Daily 80/20 Daily
80/20 Daily
2024
80/20 Your Life 80/20 Your Life
80/20 Your Life
2020