APA (7th ed.) Citation

Von Oech, R. (2001). Expect the unexpected (or you won't find it): A creativity tool based on the ancient wisdom of Heraclitus. Free Press.

Chicago Style (17th ed.) Citation

Von Oech, Roger. Expect the Unexpected (or You Won't Find It): A Creativity Tool Based on the Ancient Wisdom of Heraclitus. New York [u.a.]: Free Press, 2001.

MLA (9th ed.) Citation

Von Oech, Roger. Expect the Unexpected (or You Won't Find It): A Creativity Tool Based on the Ancient Wisdom of Heraclitus. Free Press, 2001.