APA (7th ed.) Citation

Koch, R. (1998). The 80/20 principle: The secret of achieving more with less. Doubleday Pub.

Chicago Style (17th ed.) Citation

Koch, Richard. The 80/20 Principle: The Secret of Achieving More with Less. New York: Doubleday Pub, 1998.

MLA (8th ed.) Citation

Koch, Richard. The 80/20 Principle: The Secret of Achieving More with Less. Doubleday Pub, 1998.