Cita APA (7th ed.)

Von Oech, R., & Willett, G. (1983). A whack on the side of the head: How to unlock your mind for innovation (Warner Books ed.). Warner Books.

Cita Chicago (17th ed.)

Von Oech, Roger, i George Willett. A Whack on the Side of the Head: How to Unlock Your Mind for Innovation. Warner Books ed. New York, NY: Warner Books, 1983.

Cita MLA (8th ed.)

Von Oech, Roger, i George Willett. A Whack on the Side of the Head: How to Unlock Your Mind for Innovation. Warner Books ed. Warner Books, 1983.