APA (7th ed.) Citation

Koch, R. (1998). The 80/20 principles: The secret of achieving more with less. Currency.

Chicago Style (17th ed.) Citation

Koch, Richard. The 80/20 Principles: The Secret of Achieving More with Less. New York: Currency, 1998.

MLA (9th ed.) Citation

Koch, Richard. The 80/20 Principles: The Secret of Achieving More with Less. Currency, 1998.