APA (7th ed.) Citation

Koch, R. (2008). The 80/20 principle: The secret of achieving more with less (Rev. and updated ed.). Doubleday.

Chicago Style (17th ed.) Citation

Koch, Richard. The 80/20 Principle: The Secret of Achieving More with Less. Rev. and updated ed. New York: Doubleday, 2008.

MLA (8th ed.) Citation

Koch, Richard. The 80/20 Principle: The Secret of Achieving More with Less. Rev. and updated ed. Doubleday, 2008.