Richard Koch

• 80/20 Principle
• The 80/20 Principle
• The 80/20 Individual
• Simplify
• El principio 80/20
• The 80/20 Principle : The Secret of Achieving More with Less
• Living The 80/20 Way
• 80/20 Daily
• Le principe 8o/20 faire plus avec moins
• Principio del 80/20, El (Paidos Empresa)
• Selecting Shares That Perform
• Smart Strategy