Von Oech, R., & Willett, G. (2002). Expect the unexpected or you won't find it: A creativity tool based on the ancient wischam of heraclitus. San Francisco: Berrett-Koehler.
Chicago Style CitationVon Oech, Roger, and George Willett. Expect the Unexpected or You Won't Find It: A Creativity Tool Based On the Ancient Wischam of Heraclitus. San Francisco: Berrett-Koehler, 2002.
MLA CitationVon Oech, Roger, and George Willett. Expect the Unexpected or You Won't Find It: A Creativity Tool Based On the Ancient Wischam of Heraclitus. San Francisco: Berrett-Koehler, 2002.
Warning: These citations may not always be 100% accurate.